> The reason why nannies are affordable in China is because those nannies aren't paid very much, and consequently enjoy a much lower standard of living than their employers. In Netherlands, nannies are relatively expensive, but you the employee is much closer to the socioeconomic stratum to that of their employer.

In Canada there are people making peanuts and living very poorly while technically inequality is low. The problem in Canada and other developed countries is excessive taxation of salaries. That's an orthogonal to wealth problem.