Cost of living in Nice (France) is 58% more expensive than in Zhenjiang (China)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 203 prices entered by 22 different people.
For example, you would need at least 14,873元 (€1,901) in Nice to maintain the same standard of living that you can have with 9,400元 in Zhenjiang.