凯恩斯的巨大贡献在于证明市场经济供给并不一定能够创造需求，而这种需求的缺失可能导致的经济衰退本来是可以避免的。
Keynes made a tremendous intellectual contribution in showing that supply in a market economy does not necessarily create its own demand, and that demand shortfalls can cause avoidable recessions.