An even greater challenge came from the emergence of the “rational expectations” school of economics, led by Robert Lucas.

随着以罗伯特·卢卡斯为首的“理性预期”学派的出现，一种更大的挑战也随之而来。

Instead, Lucas adopted the " rational expectations hypothesis" .

相反，卢卡斯采用了“理性预期假说”。

" Rational expectations" were not the same as flawless foresight.

“理性预期”与完美无瑕的远见不同。

With the assumption of rational expectations, Lucas felt he had " eliminated the main intellectual basis" for fiscal and monetary fine-tuning of demand.

有了理性预期的假设，卢卡斯觉得他已经“消除了需求的财政和货币微调的主要智力基础” 。