It is already being done by HFTs. https://seekingalpha.com/article/4205379-robinhood-making-millions-selling-millennial-customers-high-frequency-traders https:/

It is already being done by HFTs. https://seekingalpha.com/article/4205379-robinhood-making-millions-selling-millennial-customers-high-frequency-traders https://seekingalpha.com/article/4205379-robinhood-making-mi... The reason why this doesn't work for the average person is because they don't have the infrastructure for it or they don't trade enough to get the commissions down to make it profitable. Shorting comes with additional fees.