变量

(1)

(2)

(3)

lncases

−0.0174

−0.0673***

−0.3962***

(0.0149)

(0.0126)

(0.0570)

lnw

0.2255***

0.1454***

0.1958***

(0.0826)

(0.0560)

(0.0704)

lninv

−0.0149

0.0721**

0.2874***

(0.0587)

(0.0346)

(0.0681)

lntransport

0.1845***

−0.1085***

−0.4055***

(0.0552)

(0.0337)

(0.0710)

lngdp

−0.0666

0.1347***

0.0279

(0.0754)

(0.0415)

(0.0513)

lntrade

−0.0089

−0.0439**

−0.0713

(0.0266)

(0.0207)

(0.0627)