自9/11以来，旅行减少了。那么，人们是如何使用少度假省下的钱的呢?《圣路易斯邮报》(St. Louis Post-Dispatch)上的这篇报道表明，人们正在往地下投钱。那就是一个地下游泳池。“国家数据显示，后院游泳池的数量在过去五年中增加了约20%。”Pools aren't cheap though. The article reports costs of $40,000 and higher. Pools are estimated to increase the value of a home by 8 to 15%, so for higher-priced homes they may be a sensible investment for people who like to swim.