In the perspective of postmodern theory, the study concept of the American school contains some factors of essentialism and west-centralism. 在后现代理论的观照下，美国学派的学科理念包含了本质主义和西方中心主义的因素。
These modern theories have revived interest in the controversial subject concerning the nature and causes of business cycles. 这些现代理论重新引起了对商业周期的性质和成因这一有争议题目的兴趣。
