Can you actually link to a description of the studies? I don't think they say what you think they do. The context is important.

Also, China's economy failed to take off until they switched to basically-market-Capitalism. Korea and Japan had similarly spectacular rises starting earlier.

Also, that you're using China as an example of a "4x income max" policy is ludicrous given that China's Gini coefficient is similar to but worse than the United States'!