Haberler's two major works were
Theory of International Trade (1936) and
Prosperity and Depression (1937). He was President of the
International Economic Association (1950–1953). In 1957 the
General Agreement on Tariffs and Trade commissioned a report on the
terms of trade for primary commodities, and Haberler was appointed chairman. The report found that there was a decline in the terms of trade for primary producers, since 1955 commodity prices were said to have fallen by 5%, while industrial prices rose by 6%. Haberler's report seems to echo the report written by
Raúl Prebisch in 1949 as well as
Hans Singer in 1950. However, when a second report by Prebisch or the
United Nations Conference on Trade and Development (UNCTAD) came out in 1964, Haberler denounced it. His particular disagreement was with the idea that there was a systematic long-term (secular) decline in the terms of trade. In 1971, Haberler left Harvard to become a resident scholar at the
American Enterprise Institute. Among other things, Haberler is credited with developing the theory of opportunity cost, which was pioneered by the Englishman
John Stuart Mill (1806–1873) and the Austrian
Friedrich von Wieser (1851–1926) further developed it. Haberler died from
Parkinson's disease in 1995. == Major works ==