诚然，经济学没有预见到上个世纪的大部分重大危机，包括1920—21年大崩盘、1980—82年背靠背衰退，以及最糟糕的1929年股市崩盘后的大萧条。
Indeed, economists failed to forecast most of the major crises in the last century, including the severe 1920-21 slump, the 1980-82 back-to-back recessions, and the worst of them all, the Great Depression after the 1929 stock-market crash.