So I had a sort of specific question, but maybe I should open this up to a general discussion of how a short sale works. It's a little confusing to folks who are not deeply into markets. The idea is kind of a reverse investment, where you "sell" your stock for the market price without having actually bought any yet. Later, you are obligated to buy the stock you "sold". Honestly, I thought about it briefly, but I will have to think about it much harder, as I can't quickly identify the most likely scenario of how this works. Where does the money come from? Is stock actually purchased? Who holds the stock? Regardless, here's my original question that initially prompted me to make this thread. How long does a short seller have before they have to buy the stock? Does it vary from agreement to agreement? There has to be a limit though -- otherwise, the short seller could just wait forever and never be at a loss.