We are used to thinking that there is progress in knowledge. As we gain experience, the collective wisdom of mankind increases. The story of economics in the twentieth century provides the most amazing example of the opposite: How precious knowledge of vital importance for the welfare of humanity was gained and then lost. Many studies show that a meaningful job is the most important determinant of life satisfaction, and among the thing most desired by the general public. Economists learned how to create full employment, leading to a period of tremendous prosperity. How and why these lessons were forgotten provides a perfect illustration of the thesis that knowledge is shaped to protect the interests of the powerful.
Before the Great Depression of 1929, dominant economic theories stated that the free market automatically eliminates unemployment. Obviously, a theory which does not recognize the existence of a problem cannot provide solutions. Before the Great Depression, the economy was booming, with jobs for all and high levels of production. After 1929, factories lay idle, there was massive and persistent unemployment, and correspondingly high level of general misery. Why did unemployment persist, and how could we get the economy back to full employment of all the resources now lying idle? The revolutionary accomplishment of Keynes was to recognize the source of the problem, and provide an effective remedy. read more