Some social Formulas

1: salary.

Coastal wages: 4500
The mainland wage is 2000

Coastal consumption (including rent) is 1200 (basic)-2000
The consumption (including rent) in the mainland is 500 (basic)-1200

Wage surplus = wage-Consumption
Coastal Area: 2500 = 4500-2000
Mainland China: 800 = 2000-1200

Coastal consumption ratio: 2000/4500 = 44.44%
Consumption ratio in mainland China: 1200/2000 = 60.00%

Why is the consumption ratio in the mainland the largest?
Because: the product price in the Mainland = the product price in the coastal area.

However, the remaining wages are quite large along the coast.

The gap between the rich and the poor should come from this.