> So what would happen if you made your own "stock market" app, where people could speculate on "shares" of stock that don't include any actual ownership? You'

> So what would happen if you made your own "stock market" app, where people could speculate on "shares" of stock that don't include any actual ownership? You'd get shut down by the SEC for running a "bucket shop". https://en.wikipedia.org/wiki/Bucket_shop_(stock_market) https://en.wikipedia.org/wiki/Bucket_shop_(stock_market)