为了纪念凯恩斯诞生一百周年,我们邀请了四位获得诺贝尔奖金的经济学家撰写关于凯恩斯的文章,以评价他对经济学的贡献以及他的思想在实践中运用的状况。这四位作者是米尔顿·弗里德曼教授、弗里德里希·哈耶克教授、约翰·希克斯教授和保罗·萨缪尔森教授。对于凯恩斯主义经济学,他们的态度虽有亲疏之分,但其中没有一个人对它的重要性表示怀疑。 In honor of the one hundredth anniversary of Keynes’s birth, we invited four Nobel Prize-winning economists to write an article on Keynes to evaluate his contribution to economics and the application of his ideas in practice. The four authors are Professor Milton Friedman, Professor Friedrich Hayek, Professor John Hicks and Professor Paul Samuelson. For Keynesian economics, although their attitudes are close and independent, none of them is skeptical of its importance.