Bear with me as I'm an econ neophyte, but if as Wikipedia suggests the US stock market holds about 20 trillion USD, and the average rate of return is 10%, is 2 trillion a good estimate for how much is made in the US stock market annually?
It depends what you mean by "made in the US stock market".
The ROR can include capital gains (the price of your stocks rise) and income (you get paid a dividend). These are different, but both contribute to your returns.
