He could have pointed out that after just increasing at the same pace as overall inflation for a century, house prices suddenly jumped by more than 70 percent, after adjusting for inflation, in the decade from 1996 to 2006. He could have shown that this increase was not supported by any changes in the fundamentals of supply and demand in the housing market, nor was it matched by any remotely comparable increase in rents. If Chairman Greenspan had pointedly made the case for the existence of a housing bubble and explicitly warned of the losses likely to be suffered by individual homeowners and the huge risks being taken by financial institutions that were heavily invested in mortgages and mortgage derivatives, it almost certainly would have been sufficient to take the air out of the bubble. As a last recourse, he could have raised rates with the explicit purpose of bringing down house prices.