RE:1 more thing. The market has, does and will always set the price of shares. This is a balancing act between buying and selling pressure over time.
Long Position Traders and Investors need to understand how Short Positions differ from a typical bet on a stock and how it can affect a shareprice.
Shorting has been around for many decades and predates the Internet. It has certainly gotten out of hand in the last number of years and that is why the SEC and DOJ are changing the rules