Explanatory variables

Index

Indicator meaning

Expected relationship

The level of economic development

Lngdp

The per capita gross national product

Positive correlation

Infrastructure

Lninfrast

The per capital area of road pavement

Positive correlation

The degree of development of trade

Lntransp

The import and export volume

Positive correlation

Labor cost

Lnwage

The average wage

Uncertain

Tax factors

tax

Tax incentives index

Positive correlation