Economics is, like medicine (and unlike, say, cosmology), a practical discipline. Its goal is to make the world a better place. This is particularly true of macroeconomics, which was invented by John Maynard Keynes in response to the Great Depression. The tests of this discipline are whether its adepts understand what might go wrong in the economy and how to put it right. When the financial crisis that hit in 2007 caught the profession almost completely unawares, it failed the first of these tests. It did better on the second. Nevertheless, it needs rebuilding.
manbetx20客户端下载 学是一门实用学科,与医学一样，而与（比如说）宇宙学不一样。manbetx20客户端下载 学的目的是让这个世界变得更美好。宏观manbetx20客户端下载 学尤其如此，它由约翰•梅纳德•凯恩斯(John Maynard Keynes)在对大萧条(Great Depression)做出回应时所创。对这门学科的检验在于，宏观manbetx20客户端下载 学专家是否了解manbetx20客户端下载 中哪里可能出问题以及如何纠正。2007年爆发的金融危机几乎让该学科完全始料不及，第一次检验不及格。第二次的成绩好一些。但它需要重建。