Let me use simple words. 100 real shares of a stock out and available for normal trading at $1.00 for market cap of $100 Short sell 10 shares at $1.00 per share (total $10.00) Now there are 110 shares out in the world. Real Market cap of $100 now divided by 110 shares = new DILUTED share value of $.9090 instead of original $1.00 100 REAL shares now only worth $90.90 share valuation goes down because of SHORT DILUTION Short can now buy those 10 shares back at $.9090 per share (total $9.90) for a profit to the short of $.10 And now value of real shares after dilution is now $.9090 instead of $1.00 That should be simple enough. SHORTING is BAD!