During the period of factory handicraft industry, because capitalism was not fully developed and most countries were feudal, mercantilism was implemented, but this should not be regarded as a capitalist economic policy. With the development of capitalist economy, the improvement of productivity and the continuous expansion of the market, the first industrial revolution broke out and capitalism entered the stage of machine mass production. During this period, Adam Smith of Britain published The Wealth of Nations, calling for further lifting the feudal shackles and implementing free operation, free competition and free trade. This proposition is in line with the requirements of the bourgeoisie to develop capitalism and is conducive to further opposing feudal shackles and developing the capitalist economy. Therefore, "liberalism" became the economic policy of capitalism in this period. With the further development of capitalism and the continuous liberation and development of productive forces, capitalist countries gradually transformed into monopoly capitalism, that is, imperialism, after the second industrial revolution. At the same time, since the first capitalist economic crisis broke out in Britain from 65438 to 0825, an economic crisis has occurred in capitalist countries almost every ten years or so. In this case, capitalist countries began to implement "Keynesianism", that is, they no longer relied entirely on the market, but infiltrated national policies into the fields of resource allocation and production to reduce the impact of the economic crisis. The famous "Roosevelt's New Deal" opened up a new situation of state intervention in the economy, which was the concrete application of Keynesianism. I didn't bring my history notes. I hit them on my back, but it should be like this.