Difference Analysis of the Contribution of E-commerce and Modern Logistics to Regional Economy Based on Wireless Network

The rapid development of e-commerce has greatly promoted the development of the modern logistics industry. The application level of e-commerce and the application status of modern logistics largely determine the development of regional economic structure in a region. Under this circumstance, it is particularly important to comprehensively strengthen the research and analysis of the impact of e-commerce and modern logistics on the regional economic structure and scope, and promote the coordinated development between each other. As one of the most developed regions in China, the Yangtze River Delta region has achieved certain achievements in the development of regional logistics industry and e-commerce, and plays an important role in the process of regional integration in the Yangtze River Delta. Therefore, this paper takes the Yangtze River Delta as the research object, and empirically analyses the development status of the logistics industry and e-commerce in the Yangtze River Delta region and its contribution to regional economic growth. On this basis, it puts forward countermeasures to further increase the contribution of the logistics industry and e-commerce in the Yangtze River Delta region to economic growth. This will provide a reference for the construction of a coordinated regional logistics-e-commerce system and the realization of regional economic integration in the Yangtze River Delta region.


Introduction
At present, the process of economic globalization is accelerating and the trend of regional economic integration is increasing. This has already shown the situation of global, national and regional development. The strengthening of regional economic integration, cross-regional logistics, business flow, information flow and capital flow are also increasingly frequent, which makes the market competition between regions become more intense, and the logistics supply chain has become a key link of competition. Therefore, the modern logistics industry has received more and more attention in countries around the world and has become an emerging industry with broad market prospects. The logistics industry has played a huge role in reducing the consumption of materials, improving the productivity of enterprises and promoting economic development. Its level of development is often used as a measure of the overall economic strength and modernization of a country or region. And e-commerce has become an effective means for enterprises to reduce costs, improve efficiency, open up markets and innovate operations [1,2]. This is also an important way for regional economic transformation and development, improving the quality of economic operations and enhancing international competitiveness. It plays an important role in the sustainable development of society, optimizing the industrial structure, supporting the development of strategic emerging industries and forming new economic growth points. Due to the influence of economic, social and geographical factors, there is a significant imbalance in the development of e-commerce in various regions. On the one hand, the level of e-commerce is the result of the development of regional economic, social and geographical factors; On the other hand, e-commerce has become a new force driving regional economic growth.
At present, in the urban economic circle, which is called "centre of gravity" and "growth pole" in China, it is generally considered that there are three. That is, the Yangtze River Delta economic circle consisting of major cities in Shanghai, Jiangsu and Zhejiang provinces; The Pearl River Delta urban economic circle consisting of Guangzhou, Shenzhen, Zhuhai and other cities; The Beijing-Tianjin-Hebei urban economic circle consisting of Beijing, Tianjin, and Hebei. The three economic circles play an important role in China's economic growth. As the logistics industry and e-commerce become important factors in promoting regional economic growth. How to understand the economics of logistics industry and e-commerce in the region and the contribution of logistics industry and ecommerce to regional economic growth, so as to develop a positive and appropriate logistics industry policy, has gradually become an important topic of regional economic research. As one of the most developed regions in China, the Yangtze River Delta region has achieved certain achievements in the development of regional logistics industry and e-commerce, and plays an important role in the process of regional integration in the Yangtze River Delta [3].
The rapid development of e-commerce has greatly promoted the development of the modern logistics industry. The application level of e-commerce and the application status of modern logistics largely determine the development of regional economic structure in a region. Under this circumstance, it is particularly important to comprehensively strengthen the research and analysis of the impact of e-commerce and modern logistics on the regional economic structure and scope, and promote the coordinated development between each other. Therefore, this paper analyses the development status of the logistics industry and e-commerce in the Yangtze River Delta region and its contribution to regional economic growth with the Yangtze River Delta region as the model region. On this basis, it puts forward the countermeasures to further increase the contribution of the logistics industry and ecommerce to the economic growth in the Yangtze River Delta region, so as to provide reference for the construction of a coordinated regional logistics-e-commerce system and the realization of regional economic integration in the Yangtze River Delta region.
The Relationship Between E-commerce And Regional Economy Before analysing the interaction between e-commerce and modern logistics and economic growth, we should first make a brief understanding of the relevant concepts of modern logistics and e-commerce and related theories and related theories of economic growth [4].On this basis, the research literature on the relationship between e-commerce and modern logistics and economic growth is analysed and summarized, and the interaction mechanism between e-commerce and modern logistics and economic growth is obtained. In turn, it can more accurately analyse the contribution of e-commerce and modern logistics to the regional economy.

Analysis of transaction costs of e-commerce
The contribution of e-commerce to economic growth is reflected in the transaction process under different modes, which is the increase of economic benefits driven by transaction costs'-commerce transaction costs include the total cost of software and hardware configuration, learning and use, information acquisition, online payment, information security, logistics and delivery, and after-sales service [5].This is a combination of resource allocation, utilization, and flow processes, including several aspects as shown in Table 1 below. The network has a large amount of information, a fast propagation speed, a low acquisition cost, and can be actively obtained by a consumer by means of a classified search method. This helps consumers filter out a lot of useless information and is less restricted in terms of scope and time.

Constraints
Disadvantages of small-scale ecommerce websites The scale of the website is small, the number of transactions is small, and large-scale procurement and sales cannot be carried out. The price concessions obtained from the producers are less, and the procurement cost is higher. Therefore, the price of goods sold online is not much better than that of traditional businesses. E-commerce does not necessarily save transaction costs Without the face-to-face communication between the buyer and the seller and the real-time money and goods clearance, the trader is very likely to use the method of damaging the other party to increase his own income, so the uncertainty of the transaction will increase. In order to prevent the occurrence of opportunistic behavior, a certain cost is required. If the cost to be paid is high, one or both parties to the transaction will withdraw from the transaction, which increases the transaction cost.
From the perspective of macroeconomic system control, the cost components of e-commerce transactions include technology, logistics, customers, risk and legal factors. The specific analysis is shown in Table 2. Table 2 Cost structure of e-commerce transactions Transaction costs in the use of ecommerce Innovation cost Software and hardware costs, learning costs and maintenance costs Logistics distribution cost Logistics distribution is the goal and core of e-commerce. It is necessary to have storage outlets for goods. It is necessary to increase the expenses of transportation and distribution personnel. Therefore, the increased cost should be carefully calculated. Customer use cost A service that relies entirely on the network, as long as the consumer initially enjoys such a service, it must bear the lowest cost of several yuan per hour. Application risk cost In any case, the security of the transaction is always the primary concern. How to ensure the fairness and security of transactions on the Internet, the authenticity of the identity of the counterparty, the integrity of the transmitted information and the non-repudiation of the transaction have become the key to promoting e-commerce.
Applied legal cost Such as judicial rulings on online trading disputes, transnational jurisdiction, cross-regional online transactions, non-discrimination, etc.

E-commerce investment cost
Hardware cost The basic components of e-commerce structure are integrated network, sales pipeline, customer value and good soft environment support.

Software cost
Technical software cost and security software cost Distribution cost Logistics distribution requires the storage of goods, and it is necessary to increase the expenses of transportation and distribution personnel, thereby increasing the cost of e-commerce.

Customer cost
The customer cost of e-commerce refers to the total cost of the Internet, consulting, and payment that the customer spends in the online transaction process until the last item is in place.

Analysis of the influencing factors of e-commerce benefits
Because of the different levels of economic growth, the role of e-commerce development has different effects on economic growth. Therefore, the influencing factors of different stages of e-commerce are also different. In the initial stage of e-commerce development, factors such as enterprise information flow, capital flow and material flow directly affect the development level of e-commerce technology development and market application balance [6]. The core element of e-commerce application development is demand. That is, the combination of the supply of information flow, capital flow and material flow to a certain level after the development of the market economy reaches a certain level is to improve the efficiency through the development of e-commerce; In the development stage of e-commerce development, the contribution to regional economic growth is positive. The influencing factors are mainly the elements outside the e-commerce system. Elements outside the national economic system are also very important. Such as the international competitive environment, the country's open market economy, political and humanities and business operating environment are crucial. Due to their role, the speed and efficiency of e-commerce development will vary greatly [7].
According to China's practical experience, the market, talent, technology, finance, international and institutional environment elements of e-commerce development are all important factors at this stage. Inductively form the statistical indicators as shown in Fig. 1.

2.3
The impact of e-commerce on regional economic development The application of e-commerce has a great impact on the development of regional economy, mainly in three aspects. First, the development of e-commerce enhances regional economic efficiency, reduces overall costs, expands the scope of regional economic development, and increases the total

Methods
Research on the related role of modern logistics and economic growth, relevant literature at home and abroad, shows that the main focus is on the following three aspects: The analysis of the role of modern logistics in economic growth mainly refers to the analysis of the premise guarantee and promotion effect of the improvement of modern logistics supply capacity on economic growth; Research on the impact of economic growth on the development of modern logistics; Analysis of the interaction mechanism between modern logistics and social economy.

The impact of regional economic growth on the development of modern logistics
Modern logistics is considered to be a product of economic development to a certain stage. The impact of economic development on modern logistics is reflected in the fact that the substantial growth of the economy will lead to an increase in demand for logistics, and the increase in logistics demand can promote the development of modern logistics. On the other hand, the level of economic development determines the level of development of modern logistics [9]. The substantial economic growth will inevitably lead to the flow of huge materials and products, which will inevitably lead to an increase in the flow of goods. This is an inevitable law of economic development and an inevitable law of logistics development. The impact of economic growth on the development of modern logistics is mainly shown in Table 3. Table 3 The impact of economic growth on the development of modern logistics Rapid economic growth leads to an increase in logistics demand Under the market economy conditions, the increase of logistics demand is an important market signal to stimulate logistics supply and promote logistics development. Therefore, the rapid economic growth has brought about further deepening of the professionalization of socialization, resulting in an increase in demand for logistics. Finally, the logistics are continuously developed and the logistics system is continuously improved. The state of economic development determines the degree of modernization of logistics The development of logistics requires the investment and improvement of infrastructure, and the investment of investment facilities is characterized by large scale, long investment cycle and long investment recovery period. Therefore, only when the economy develops to a certain level, the society will have sufficient manpower, material resources and financial resources to invest in the logistics infrastructure to further promote the development of logistics.
3.2 The interaction mechanism between modern logistics and regional economic growth Modern logistics and regional economic growth are interdependent entities. Modern logistics is the main component of regional economic growth and a leading force in the formation and development of economic systems. Modern logistics has a dual function in economic development, namely, subordinate function and guiding function (ie, basic role and promotion role).At the same time, the faster the regional economic growth, the higher the demand for logistics, and the greater the dependence of the economy on logistics. Logistics is becoming more and more important in regional economic growth, and the greater the role of the economy in promoting logistics development [10].The interaction between modern logistics and economic growth can be described by the causal diagram of Fig. 2. 3.3 The impact of modern logistics on regional economic development The impact of modern logistics on the regional economic scope is mainly reflected in the regional economic radiation range. The larger the scope of modern logistics outward radiation, the more it can promote the expansion of the regional economic scope.In addition, the efficiency of modern logistics is affected by the speed of physical logistics, which limits the speed of modern logistics and the outward radiation, which limits the scope of outward radiation of products, thus limiting the expansion of regional economic scope. When the product circulates beyond the single-point radiation range, another adjacent product outlet continues to radiate outward [11]. The wider the single-point radiation range and the higher the degree of modern logistics, the smaller the network points required under the same coverage area, which can effectively reduce the operating costs of enterprises, optimize the operating environment of enterprises, and improve the comprehensive competitiveness of enterprises. In the process of development, the regional economy not only needs the interaction of various factors in the region, but also pays attention to the interaction between production and circulation and production factors. In a large regional economic market, there may be frequent economic constraints and trade barriers, as well as frequent exchanges of production factors and products. Under the combined influence of external factors and internal factors, such activities may solve two problems. One is the issue of object ownership [12]. The second is the issue of physical circulation, which is often referred to as logistics. The development of inter-regional logistics activities can promote the growth effects of demand and supply. Experiment 4.1 The comprehensive impact of modern logistics and e-commerce on regional economic development E-commerce and modern logistics will have a greater impact on the regional economic structure and scope. The impact is mainly from the aspect of industrial structure, which in turn affects the trend of regional economic scope. This paper sets the regional economic scope as the ordinate, and takes the application of modern logistics and e-commerce as the abscissa, and obtains the influence curve of ecommerce and modern logistics application degree on the regional economic development range, as shown in Fig. 3.
Among them, the e-commerce impact curve shows that with the increase of the degree of ecommerce application, the regional economic scope presents a power function curve with a power exponent greater than 1 (eg: ), and there is no limit. This is determined by the characteristics of ecommerce. For non-physical goods or services, such as information services and music downloads, they are not affected by regional restrictions and radiate to the world. The modern logistics impact curve shows that with the improvement of modern logistics, the regional economic range shows a certain limit function curve (such as:).Among them, C and e are constant 1 trend growth, when modern logistics is raised to a certain extent, it will not be able to pass the restriction of logistics speed. To achieve a certain limit efficiency, the product radiation range is limited, thus controlling the regional economic range to a certain limit [13]. In the figure, the regional economic range value corresponding to the focus A of the two curves indicates that there is a most reasonable single-point radiation range for the product under the joint action of e-commerce and modern logistics.This range of radiation ultimately leads to a reasonable regional economic range. In other words, in the case of single-point radiation of products, a reasonable regional economic range is equal to the single-point radiation range of the product. In this reasonable regional economy, the links between industries are sufficiently close, coordinated and consistent; Natural resources, human resources and transportation resources are fully utilized without excessive abuse; The effective service range of the product is just right, the efficiency of matching e-commerce and modern logistics is used to the extreme, and the user's timely demand for goods is maximized [14].If you go beyond this reasonable area to develop a regional economy, everything will be counterproductive.

4.2
The contribution of e-commerce and modern logistics to the regional economy As one of the important indicators to measure the economic development of a region, the development of e-commerce and modern logistics will make a great contribution to the development of regional economy and play a decisive role in the economic development of a region. The contribution of e-commerce and modern logistics to the regional economy is shown in Table 4. Table 4 Contribution of the development of e-commerce and modern logistics to the regional economy The development of e-commerce and modern logistics provides strong logistical support for the development of regional economy E-commerce and modern logistics industry are the products of regional economic development. As a service industry, it provides a strong logistical support for the development of regional economy and supports the development of regional economy. At the same time, it links the various parts of the regional economy together, making them a unified organic whole. The development of e-commerce and modern logistics can improve the operational efficiency of the regional economy.
The development of regional logistics can significantly reduce transaction costs and improve the operational efficiency of the regional economy; Specialized logistics service providers and e-commerce platforms can provide a trading platform for both supply and demand sides of logistics and e-commerce, facilitating communication and cooperation between logistics partners, thus greatly reducing the cost of searching for information. Developing e-commerce and modern logistics can improve the operational efficiency of the regional economy while reducing transaction costs.Thereby ensuring the on-time supply of raw materials, parts and components required for production in the region and the rapid output of finished products, thereby promoting the improvement of regional economic operation efficiency. E-commerce and modern logistics can form the growth pole of regional economy

Great contribution to GDP
The development of e-commerce and modern logistics has a great effect on the economic development of a country or region, and is one of the pillar industries of the regional economy. Strong correlation and driving effect E-commerce and modern logistics cover a wide range, and its development is not only conducive to reducing the operating costs of other industries in the region, but also driving the development of new technologies such as new technologies, new energy, new materials and new equipment related to logistics It can also promote the development of other industries such as business and transportation in the region. Become a pillar industry in the region The growth pole itself has strong innovation and growth capabilities, and promotes the growth of other industries through the multiplier expansion effect of external economic and inter-industry linkages. Optimize regional industrial structure and resource allocation It can enable all regions and enterprises to avoid unreasonable duplication of construction and blind competition caused by it. It can also reduce the logistics costs of various enterprises in the region, reduce capital and inventory, and improve logistics efficiency. Optimize resource allocation on a macro level, achieve better economic benefits, and make better economic benefits, and make the regional economy continue to develop E-commerce and modern logistics have a "diffusion effect" on the development of regional economy E-commerce and modern logistics have a radiation effect on the development of regional economy. The regional central city is a collection and diffusion centre for economic production factors and production results of transportation, information, materials, products, and finance. The development of e-commerce and modern logistics industry will inevitably play a good role in supporting and promoting the development of the entire region. The development of e-commerce and modern logistics industry can promote the coordinated development of the economy across the region. The development of e-commerce and modern logistics industry, while improving the quality of regional economic operations, it is also possible to improve the competitiveness of local economies in various regions as a whole. Improve regional investment environment to attract foreign investment Through the development of e-commerce and modern logistics industry, it is possible to re-combine various functions, and also reduce transaction costs, so that the location of enterprises and industries has a greater choice of space. Rather than being limited to raw material origins or consumer markets, all investment decisions will be based on the company's business strategy and the most economical logistics solution, so that the company's investment is efficiently rewarded. Optimize regional environment Through the establishment of a sound logistics distribution system and ecommerce online trading platform, rationally layout logistics outlets, under the premise of ensuring regional economic needs and residents' living needs, can reduce truck traffic and ease traffic pressure in the region. By promoting the use of various green fuels and improving the emission standards of truck exhaust, it can reduce exhaust pollution, optimize the living environment of people in the region, and also create a good investment environment for the region. Increase employment opportunities E-commerce and modern logistics industry are service industries in the tertiary industry, which are composed of electronic customer service, backend network operation, packaging, loading and unloading, transportation, distribution, storage, distribution processing, and logistics information. With the development of e-commerce and modern logistics industry, the more job opportunities it can create, the more labour will be absorbed.

Results
As an emerging industry, e-commerce and modern logistics industry are an important part of the regional economy, and there is a strong correlation between the two. On the one hand, the development of e-commerce and modern logistics has a significant contribution to the economic development of a region; On the other hand, the development of regional economy can promote the development of e-commerce and modern logistics industry, and ultimately determine the development level of e-commerce and modern logistics [15].Freight volume is the most important indicator of logistics demand, which can reflect the scale of logistics market demand from the totalled-commerce transaction volume as an input factor of economic growth, the change in ecommerce transaction volume will be reflected in the change in freight volume.
As one of the most developed regions in China, the development of the e-commerce industry and the modern logistics industry in the Yangtze River Delta, the Pearl River Delta and the Beijing-Tianjin-Hebei urban economic circle has already reached a certain scale and level. The development of e-commerce industry and modern logistics also contributes to the economic growth of these regions. This chapter will analyse the contribution of e-commerce and modern logistics development in the Yangtze River Delta region to its economic growth.

General introduction of the Yangtze River Delta region
The Yangtze River Delta has convenient transportation, developed railway transportation, numerous airports, and is dotted along the river ports. At present, the Yangtze River Delta region has basically formed a transportation mode in which passenger transportation is mainly based on roads and railways, and freight transportation is mainly based on water transportation and road transportation. The convenience of transportation provides the basis and guarantee for the smooth progress of e-commerce transactions. In terms of highways, the inter-regional expressways that have been completed and opened to traffic in the Yangtze River Delta region mainly include: Shanghai-Nanjing Expressway, Shanghai-Hangzhou Expressway, Humin Expressway, Ningnan Expressway, and 104 National Highway connecting Beijing-Jinan-Nanjing-Guangzhou; In terms of railways, the main railway lines in the Yangtze River Delta region are: Shanghai-Nanjing Railway, Shanghai-Hangzhou Railway, Hangzhou-Ningbo Railway, Zhejiang-Jiangxi Railway, Xuanhang Railway, and Ninglang Railway.And in the transportation mode of high-speed rail trains, it provides a quick and cheap logistics choice for online trading of some fresh products;In terms of coastal ports, the coastline of the Yangtze River Delta is 2,965 kilometers long and the coastline of the island is 4,605 kilometers long [16].The port is above the seaport. The north wing includes six major inland river ports: Nanjing Port, Zhenjiang Port, Jiangyin Port, Zhangjiagang Port and Nantong Port. The south wing mainly includes ports such as Ningbo Port and Zhoushan Port.The above-mentioned overseas Takahashi Logistics Center, Shanghai Pudong Airport Logistics Center, Nanjing Longtan Port Integrated Logistics Park, Hangzhou Modern Canal Logistics Park and other logistics centers provide the foundation for the vigorous development of modern logistics.

Contribution analysis
5.2.1 Regression model analysis of the contribution of e-commerce and modern logistics to economic growth in the Yangtze River Delta region Increasing the volume of e-commerce transactions, increasing the volume of freight, and accelerating the turnover rate of logistics are the key to improving the speed and quality of regional economic operations as a whole. Therefore, we can reflect the development trend of e-commerce and logistics industry in the Yangtze River Delta by establishing a trend model of e-commerce transaction volume and freight volume.
Using the least squares method (Equation 1), establish a trend model for e-commerce transaction volume and freight volume: [Please see the supplementary files section to view the equation.] (1) As shown in Figure 4, the freight volume of the Yangtze River Delta region from 1997 to 2017 showed a clear upward trend over time. According to the data of freight volume in the Yangtze River Delta region from 1997 to 2017, using SPSS19.0 to establish a linear regression model, we can get the regression equation of freight volume and e-commerce transaction volume in the Yangtze River Delta region: [Please see the supplementary files section to view the equation.] (2) We need to test the above model. From the regression results, the sample correlation coefficient, the fitting coefficient, the degree of fitting is very high, and the representativeness of the regression equation is strong. In addition, since the sum of squared residuals (the sum of the squares of the differences between the sample values and the predicted values) and the sum of the squares of the regressions (the sum of the squared values of the predicted values and the mean values) are independent of each other, the sum of the squares of the total deviations is given under given sample conditions. (The sum of the squares of the difference between the sample value and the mean value) is fixed. The larger the square of the regression is, the larger the value of the F statistic used in the test is, the larger the value of the F statistic used for the test, the amount of freight and the amount of e-commerce transaction and time, the more linear the correlation is. After calculation, the value of the F statistic used in the test is 228.942, and the associated probability value indicates that the regression model established under the condition of the significance level of 0.05 is significant, that is, the linear regression model is reasonable [17].From the regression equation, the regression coefficients of the regression model are 5281.3827 and 10221.293, which indicates that the freight volume in the Yangtze River Delta region is increasing by an average of 1,021,293,300 tons per year, and the e-commerce transaction volume is increasing at an average annual rate of 528,138,770 yuan.

Regression model of the contribution of e-commerce and modern logistics industry development in the Yangtze River Delta region to regional economic growth
The development of the regional logistics industry has a significant contribution to the economic development of the entire economic region. Here, this study selects GDP in the Yangtze River Delta region as the explanatory variable, representing the level of economic development in the Yangtze River Delta region; Taking freight volume as an explanatory variable, it represents the development level of the logistics industry in the Yangtze River Delta region. By establishing a regression model of GDP to freight volume and e-commerce transaction volume, it reflects the contribution of regional logistics and e-commerce to the economic growth of the Yangtze River Delta region. Similarly, the regression model of GDP for e-commerce transaction volume and freight volume is: [Please see the supplementary files section to view the equation.] (3) The relationship between e-commerce transaction volume and freight volume and GDP in the Yangtze River Delta region from 1997 to 2017 is shown in Figure 5.
As can be seen from Figure 5, there is a significant positive correlation between GDP and freight volume and e-commerce transaction volume. This shows that increasing the volume of goods and ecommerce in the whole society, and carrying out regional logistics activities and e-commerce activities will contribute to the economic development of the Yangtze River Delta region. According to the data of freight volume in the Yangtze River Delta region from 1997 to 2017, using SPSS19.0 to establish a linear regression model, we can get the regression equation of GDP in the Yangtze River Delta region as: [Please see the supplementary files section to view the equation.] (4) The above model is tested. From the regression results, the sample correlation coefficient , the fitting coefficient , and the degree of fitting are very high. In addition, the value of the F statistic used for the calculation test is 116.394, accompanied by the probability value , indicating that the established regression model is reasonable under the condition that the significance level is 0.05.It can be seen from Equation 4 that increasing the freight volume and e-commerce business in the Yangtze River Delta region and vigorously developing the regional logistics industry and e-commerce will contribute to the national economic growth in the Yangtze River Delta region.
Through the above two models, we can see that because the Yangtze River Delta is located in the eastern coastal areas of China, it has obvious geographical advantages and economic development advantages. Therefore, the development of the logistics industry in the Yangtze River Delta region has been developed earlier and has formed a certain scale, which has a certain contribution to the economic development of the region.Especially in recent years, the development of the logistics industry in the Yangtze River Delta region has played an important role in the rapid development of the regional economy.

Analysis of the Differences in Regional Logistics and E-Commerce Contribution to Economic
Growth in the Yangtze River Delta Region At present, the development of the logistics industry in the Yangtze River Delta region has achieved certain achievements and has contributed to the growth of GDP. According to the "13th Yangtze River Delta regional logistics and e-commerce and other service industries to GDP growth is shown in Figure 6.
It can be seen from Figure 6 that from the perspective of the added value of the logistics industry and e-commerce business as a percentage of GDP, regional logistics and e-commerce have contributed to the growth of GDP in the Yangtze River Delta region and greatly exceeded other service industries. In addition, we can calculate the contribution rate of logistics industry and ecommerce to GDP growth in the Yangtze River Delta region. Assume that the combined effect of the growth of the various sectors of the national economy and the result is the growth of GDP in the whole society. The impact of various sectors on GDP is directly proportional to the proportion of GDP in the sector to the GDP of the whole society. Then define the contribution rate of the logistics industry to GDP growth as shown in Equation 5: [Please see the supplementary files section to view the equation.] According to the above formula, the GDP of the logistics industry is represented by the GDP of the transportation, warehousing and postal and telecommunications industries (or by transportation, warehousing and postal services). The GDP of e-commerce transactions represents the GDP of ecommerce. According to the relevant data of 2010-2017 China Statistical Yearbook, Shanghai Statistical Yearbook (2017), Jiangsu Statistical Yearbook (2017) and Zhejiang Statistical Yearbook (2017), we can calculate the contribution rate of the logistics industry in the Yangtze River Delta region to GDP growth in recent years. The result is shown in Figure 7.
In summary, the current logistics industry and e-commerce in the Yangtze River Delta region have contributed to the growth of GDP, and in terms of the proportion of industrial added value to GDP, its contribution exceeds that of other service industries. The regional logistics industry and ecommerce belong to the service industry in the tertiary industry, and the optimization of industrial structure is measured by the development level of the tertiary industry. Therefore, to examine the proportion of the added value of the logistics industry and e-commerce in the Yangtze River Delta region in the tertiary industry, we can find out the contribution of regional logistics to optimizing the industrial structure of the Yangtze River Delta region.
From any angle, the role of e-commerce and modern logistics in the development of the economy can be considered significant. As one of the important drivers of economic growth, the role of investment cannot be ignored. China is currently in a critical period of economic transformation. The role of the other party's openness in regional economic development is also significant. In the absence of domestic demand, the development of China's economy must be integrated into the development of the world economy. Under this circumstance, modern logistics and e-commerce are very important. Trade agreements and trade disputes in different regions of the world have escalated, and vying for the world's markets is an important means of upgrading the country's economy. China has always attached importance to foreign trade, and we cannot do without the positive impact that opening up has brought to our own economic development. Differences in the degree of openness of each other in different regions will affect the level of local economic development. The construction of the e-commerce network is based on the Internet. The original business model is based on the individual's development of the customer group, and establishes business relationships through communication and contact. The openness of e-commerce to the customer base is based on the network, and naturally there are large-scale potential customers. As long as the attention is paid on the Internet platform, the number of customers will be geometrically long. For example, the rise of Haitao Store opened the offline stores to the Internet, which made the original smaller shops face a wider customer base, thus promoting the expansion and development of business scale. The development of e-commerce has automatically led to the development of the offline logistics industry, thus complementing each other, promoting each other and developing together. Discussion E-commerce and modern logistics have greatly affected the development of regional economy. In this case, we take effective measures to develop a sound development strategy. By actively promoting the development and application of e-commerce, rationally arranging the development of logistics parks, and accelerating the construction of transportation infrastructure and freight information networks, we will promote coordinated development and promote the sound and rapid development of the regional economy. Through the analysis of this research, we find that the rapid development of e-commerce and modern logistics has a significant positive effect on the regional economic growth. In the economic development of various regions, focusing on the promotion of e-commerce and the use of modern logistics play an important role in improving the level of regional economic development.
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Funding
The study was supported by "Natural Science Foundation of Heilongjiang Province: stress response and policy guidance of pig industry chain under environmental regulation, (Grant No. jj2019lh2563)".

Authors' contributions
Xiaodong Tang was responsible for the survey and analysis of the data, and Gangyi Wang was responsible for the writing of the paper. Basic causal relationship between modern logistics and regional economic development Legend: Figure 2 show Basic causal relationship between modern logistics and regional economic development Figure 3 The impact of the degree of application of e-commerce and modern logistics on the scope of regional economic development Legend: Figure 3 show The impact of the degree of application of e-commerce and modern logistics on the scope of regional economic Relationship between e-commerce transaction volume and freight volume and GDP in the Yangtze River Delta region from 1997 to 2017 Legend: Figure 5 show Relationship between e-commerce transaction volume and freight volume and GDP in the Yangtze River Delta region from 1997 to 2017 Equations.docx