premise: If you bought Nortel (NYSE:NT) last year at $5, and today it's selling for $2.50, <hypo>. This is important enough that I want to repeat it: The market does not care how much you paid for Nortel.
hypothesis: <hypo> should be "your decision to hold on to the stock, to sell it, or to buy more, should have absolutely nothing to do with whether you think you will "get back to breakeven""