After Marshall, Keynes established the macroeconomics, and Paul Anthony Samuelson has colligated the microeconomics of Marshall and the macroeconomics of Keynes to form the New Classical School.

• 下篇，在简要回顾马歇尔之后经济学的百年发展历程的基础土，提取出通常认为与新古典分析方法上存在较大差异的四个理论问题，进行了一次回归。