Research Article
Can Highway Networks Promote Productivity? Evidence from China
Table 4
Statistical description of the main variables.
| Name | Description | Mean | Standard deviation |
| TFP | Log of enterprise total factor productivity | 3.2084 | 1.1014 | Traveltime | Log of travel time to various cities | 8.9189 | 0.2715 | MP | Log of market potential | 12.3972 | 0.6102 | Age | Log of enterprise age | 1.9973 | 0.7960 | Scale | Log of total enterprise assets | 9.8982 | 1.5983 | Export | Ratio of export delivery value to gross industrial output | 0.1498 | 0.3358 | Own state | Ratio of state-owned capital to the total assets of the enterprise | 0.0468 | 0.2004 | GDP | Log of GDP | 7.4207 | 1.1388 | R&D | Log of city R&D capital | 11.89178 | 2.3912 | POP | Log of population | 8.1434 | 1.8344 | FDI | Log of direct foreign investment | 12.9379 | 1.9006 | Railway | Log of ordinary railway mileage | 5.3951 | 0.9881 |
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