Cost of living in San Luis Potosí (Mexico) is 26% cheaper than in Zhenjiang (China)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 111 prices entered by 11 different people.
For example, to keep the same standard of living that would require 元9,800 in Zhenjiang you would need to make just about 元7,206 (Mex$ 22,166) in San Luis Potosí.