If normal demand does not improve before the exceptional sales generated by the scheme come back down to earth, Detroit could find itself on a shakier footing once again.

• 以史为鉴，如果美国没能在援助计划所造成的异常抢购热潮无以为继之前使正常的市场需求得到增加，那么底特律会绝望地发现自己又处在一个即将喷发的火山口上。