You can just look at the average returns of the non-peons to see that they're unlikely to be using insider trading. When I was at university, a meaningful perc

You can just look at the average returns of the non-peons to see that they're unlikely to be using insider trading. When I was at university, a meaningful percentage of my Chinese classmates' parents had paid for their expensive overseas tuition by making 'informed' investments in the stock market, and thought nothing of it. Bribery and insider trading (stock tips are effectively one form of bribery) are absolutely the standard in China.