Keynesian economics (English), or Keynesianism (English), Keynesian theory (English) is an economic theory based on the ideas of British economist john maynard keynes in his book "General Theory of Employment, Interest and Money", which advocates that countries adopt expansionary economic policies and promote economic growth by increasing aggregate demand.

(1) The pioneer of alvin hansen's neoclassical comprehensive school, a famous American Keynesian, is known as an American Keynesian architect. Theoretically, Hansen, who originally studied the theory of economic cycle and crisis, is a believer in neoclassical economic theory and has objections to Keynesian theory. From 65438 to 0937, after teaching at Harvard University, he turned to Keynesian theory and actively advocated and spread Keynesianism in the United States. He paid attention to the propaganda of Keynes's works, which made Keynes's theory "popular" and "Americanized". Representative works include Full Recovery or Stagnation, Fiscal Policy and Economic Cycle, Economic Policy and Full Employment, Monetary Theory and Fiscal Policy, A Guide to Keynesian Theory, and American Economy and Economics in 1960s.

② John Richard Hicks Hicks 1972 won the Nobel Prize in Economics. He published a lot of books and designed a wide range of theories in his life. Hicks introduced general equilibrium and ordinal utility analysis to form his value theory, which greatly changed Anglo-American orthodox economics. The IS-LM model put forward by him when commenting on Keynes's General Theory is widely used in modern economics. Hicks' representative works include: Value and Capital, Reconstruction of Consumer Surplus Theory, Contribution to Economic Cycle Theory, Revision of Demand Theory and Capital and Growth.

(3) Paul A Samuelson, a famous American economist, is the most important representative of neoclassical synthesis. 1970 developed static and dynamic economic theories, improved the quantitative analysis level of economic science, and won the Nobel Prize in Economics. Samuelson has his own revision, supplement, refinement or development in almost all aspects of western economics. His main works are: Fundamentals of Economic Analysis, Economics, Linear Programming and Economic Analysis, co-authored with Dofman and Thoreau. The main papers are: The Joint Function of Multiplier Analysis and Acceleration Principle, The Balance between International Trade and Production Price, The Fable and Reality of Capital: Alternative Production Function, Liberals in Difficulties, etc.