I know what the author is trying to say, but the way it's being said doesn't resonate with me. GRPN may fall to half its IPO price, but it won't be a half price deal, it will simply be worth less today than it was at IPO time.<p>The markets for stocks behave very differently than the markets for, say, spa treatments, in large part because nobody has commoditized spa treatments. Buying a spa treatment for half off doesn't say something about the market valuing it differently today than yesterday, it says something about the spa's marginal cost of offering a treatment during an idle time slot and price discrimination.<p>Whereas, GRPN's price says something about market segmentation alone: The folks who bought the hype have all bought the stock and now it will trade according to the expectations of the rest of the market.