Marc Nerlove, and George S. Tolley. In 1979, Schultz was awarded the Nobel Prize in Economics for his work in human capital theory and economic development. Contribution to economic theory Human capital theory While he was chair of economics at Chicago he led research into why post-World War II Germany and Japan recovered, at almost miraculous speeds, from the widespread devastation. Contrast this with the United Kingdom which was still rationing food long after the war. His conclusion was that the speed of recovery was due to a healthy and highly educated population; education makes people productive and good health care keeps the education investment around and able to produce. One of his main contributions was later called Human Capital Theory, which he formulated with the help of Gary Becker and Jacob Mincer. Schultz coined this theory in his book titled Investment in Human Capital; however, he experienced negative feedback from other economists. He states that knowledge and skill are a form of capital, and investments in human capital leads to an increase in both economic output and workers’ earnings. Many economists refused to support his theory of considering humans as a form of capital due to slavery, which at the time was an understandable critique given the civil rights movements at this time. Schultz argues that his theory does not dismiss humanity but instead encourages individuals to invest in themselves. He advocates for humans to invest in their health, internal migration, and on-the-job training; however, he focuses on encouraging individuals to better their education in order to increase their level of productivity. He states that if people were to do these things, they would have many more opportunities available for them to better their economic situations. He also inspired much work in international development in the 1980s, motivating investments in vocational and technical education by Bretton Woods system International Financial Institutions such as the International Monetary Fund and the World Bank. During his research Schultz got down to details and went out among the poor farming nations of Europe, talking to farmers and political leaders in small towns. He was "not afraid to get his shoes a little muddy." He noticed that the aid the United States sent in the form of food or money was not only of little help but actually harmful to such nations, as the farmers and agricultural producers within those nations were not able