经济学是致用之学。然而，对经济学如何致用，却是一个久有争议的问题。“规范”与“实证”之分，科学与方策 (理论与政策 )之别，反映了人们力图在经济学与它的应用之间划出一条边界的努力。但是，这条边界却一直模糊不清。 　　从经济学发展的历史来看，在中国，“经济”一词 Economics is a useful science. However, how to apply economics, but it is a long-standing controversial issue. The distinction between “norms” and “positivists” and the differences between science and policy (theory and policy) reflect the efforts of people to draw a line between economics and its application. However, this border has always been blurred. From the history of economic development, in China, the word “economy”