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我们今天讨论的是经济学的跨学科创新,我觉得最成功的就是和数学的结合,所以我今天讲经济学怎么因为数学而彻底改变了。这个大概发生在100年以前,是门格尔和杰文斯等人把微积分用到了经济学。自从斯密写国富论,把经济学放在一个有逻辑的框架里面以后的100年,经济学有了不少进步,但不是本质的进步,本质的进步是发生在经济学使用了数学。我认为从那以后,我们把它叫做新古典,在那以前就是老的古典,老的古典经济学是不用数学的。
What we are discussing today is the interdisciplinary innovation in economics. I think the most successful one is the combination with mathematics. So today I talk about how economics has been completely changed by mathematics. This probably happened 100 years ago, is Menger and Jevons and others calculus used in economics. In the 100 years after Smith wrote the Wealth Theory and put economics in a logical framework, economics has made a lot of progress, but it is not an essential step forward. The essential progress took place in the use of mathematics in economics. I think since then we have called it neoclassical, then it was the old classical, the old classical economics without mathematics.