From an economist's point of view, there are two striking aspects of This Time Is Different. The first is the sheer range of evidence brought to bear. Reading Reinhart and Rogoff is a reminder of how often economists take the easy road -- how much they tend to focus their efforts on times and places for which numbers are readily available, which basically means the recent history of the United States and a few other wealthy nations. When it comes to crises, that means acting like the proverbial drunk who searches for his keys under the lamppost, even though that's not where he dropped them, because the light is better there: the quarter-century or so preceding the current crisis was an era of relative calm, at least among advanced economies, so to understand what's happening to us one must reach further back and farther afield. This Time Is Different ventures into the back alleys of economic data, accepting imperfect or fragmentary numbers as the price of looking at a wide range of experience.