The Chinese stock market has changed a lot since the late 1980s. The way it works, who can trade, and the rules that govern it have all been influenced by China's growth and government actions. Different parts of the market cater to different types of investors and companies. This segmentation has changed over time, so it's important to be careful when looking at stock data from different years. Some unique features of the Chinese market, like state-owned funds to stabilize prices, also exist in other countries. There's not a lot of information about these issues, so more research is needed.