He coined a phrase, "the paradox of thrift, " to point out that what was rational for an individual during hard times ? saving money ? could be ruinous for an entire economy.

他创造了一个词“节约的悖论”，指出在经济困难时期，个体的理智行为（存钱）可能对整体经济是有害的。

youdao

That could actually make it harder for households to increase their saving - an effect know as the paradox of thrift.

BBC: 'Years needed' to rebuild wealth