Table 1 The inputs and outputs of the DEA model
Inputs | Outputs |
|---|---|
INVESTMENT | SUPPLY |
 I1 investment in wireless access network |  S1 mobile phone exchange capacity |
 I2 investment in transmission network |  S2 size of carriers |
 I3 investment in service network | ADOPTION |
 I4 investment in supporting network |  A1 customer size |
 I5 investment in construction |  A2 customer size of cellular data service |
| Â | USAGE |
|  |  U1 calls duration per month |
|  |  U2 cellular data traffic per month |
| Â | REVENUE |
|  |  R1 revenue per month |
|  |  R2 revenue of cellular data service per month |