NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by William M. Hynes

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March 2009Commodity Market Disintegration in the Interwar Period
with David S. Jacks, Kevin H. O'Rourke: w14767
Using data collected by the International Institute of Agriculture, we document the disintegration of international commodity markets between 1913 and 1938. There was dramatic disintegration during World War I, gradual reintegration during the 1920s, and then a very substantial disintegration after 1929. The period saw the unravelling of a great many of the integration gains of the 1870-1913 period. While increased transport costs certainly help to explain the wartime disintegration, they cannot explain the post-1929 increase in trade costs. Protectionism seems the most likely alternative candidate.

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