# Table 4 Description of explanatory variables

Description of explanatory variables
NM Number of net migrants
If i = 1(x), expected urban wage$1 ( x ) ∗∑$ urban hukou j
Ewu-gap −expected urban wage 2(x)urban hukou 1(x)
If i = 2(x), expected urban wage 2(x)urban hukou 1(x)
−expected urban wage 1(x)urban hukou 2(x)
If i = 3(x), -expected urban wage 1(x)urban hukou j(x);
j = 1…18, i ≠j,1(x) stands for the highest expected urban wage city
If i = 1(x), city population$1 ( x ) ∗∑$ agricultural hukou j
P-gap −city population 2(x)agricultural hukou 1(x)
If i = 2(x), city population 2(x)agricultural hukou 1(x)
−city population 1(x)agricultural hukou 2(x)
If i = 3(x), -city population 1(x)agricultural hukou j(x)
j = 1…18, i ≠j,1(x) stands for the biggest city population city
If i = 1(x), capital stock$1 ( x ) ∗ ∑ j$ agricultural hukou
−capital stock 2(x)agricultural hukou 1(x)
K-gap If i = 2(x), capital stock 2(x)agricultural hukou 1(x)
−capital stock 1(x)agricultural hukou 2(x)
If i = 3(x), -capital stock 1(x)agricultural hukou j(x)
j = 1…18, i ≠j,1(x) stands for the largest amount of capital stock city
If i = 1(x), single female$1 ( x ) ∗∑$single female j
−single female 2(x)single female 1(x)
SFP-gap If i = 2(x), single female 2(x)single female 1(x)
−capital stock 1(x)single female 2(x)
If i = 3(x), -single female 1(x)single female j(x)
j = 1…18, i ≠j,1(x) stands for the smallest number of single female city
If i = 1(x), urban hukou$1 ( x ) ∗∑$ agricultural hukou j
−urban hukou 2(x)agricultural hukou 1(x)
UH-gap If i = 2(x), urban hukou 2(x)agricultural hukou 1(x)
−urban hukou 1(x)agricultural hukou 2(x)
If i = 3(x), -urban hukou 1(x)agricultural hukou j(x)
j = 1…18, i ≠j,1(x) stands for the biggest number of urban hukou city