Home building is a miserable business. First you borrow to buy land, then borrow some more to develop land, then more to build, while paying out exorbitant executive compensation all along. Years later, you finally sell the finished product, maybe for a profit, maybe at a loss. Builders have been buying more land at much higher prices in hope for a continuation of optimal conditions. Lucrative margins can turn into large losses, much like 2006-07. Unless the Yellen Fed comes up with a big surprise, shorting rallies will be the way to go.