I do know that stock markets trade in the ownership of companies, but to what end it's being used or whether it has any interesting features I can't tell you. I didn't know about the GDP, but I was going from the top 100 Chinese company's public ownership share (the majority of top 100 companies are majority state owned, plus an additional ~15% that's classified as mixed ownership, between 10% to 50% state ownership). that's a bit misguided of me and I apologize.