...We are a country obsessed with consumption, which would be fine if we seemed to be fulfilled getting bigger TVs but having less time to watch them. But, in the aggregate, that's not the case. "The things that we get used to most easily and then take for granted are our material possessions -- our car, our house," writes Layard. "But there is lots of evidence that people underestimate the process of habituation." The amount of happiness we think we'll get from a new house, and the amount of happiness we actually get from a new house, are not the...