In 1870 modern economic analysis emerged with the idea of responding to economic problems, especially the determination of the causes of development and the accumulation of wealth. The economy went on to worry about scarce resources between alternative uses in order to optimize consumer satisfaction.
1929 is the year of the Great Depression. This event caused a crisis of conscience among economists, who perceived that classical science did not allow them to analyze the expansion of economic activity and develop adequate economic policies to overcome the crisis.