if you buy 1 stock at $3 and the stock keeps sliding, you cut loss by selling at $2 (and short another 1 share at $2, thank you @maricel for pointing out), the stock continues to fall to $1 and you bought it again seeing the price is attractive. the stock rebounds to $2. do you breakeven? diluted cost says (3-2+1)/1=2. but in actual fact, you have already broke even. in fact, you earned $1 profit. why? because you shorted with your share at $2 and bought back at $1 this earning $1. then the stock rebounded from $1 to $2, you earn $1 again. so total profit is (-1+1+1=1)
the moral of this story is that you have to short with your own stock and start doing your book keeping. sell half or everything at each huge rebound. buy back again at new lower low. this is a bear market and new lows will be made. good luck.
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