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α: calibrated so average coauthorship-adjusted count equals average raw count
New growth theories suggest that an economy's increased openness raises domestic productivity, and hence must have a positive effect on the living standards of a nation. The North Korean economy, isolated from world trade for several decades and its economy devastated, provides a test for this implied causality. The possibility that the ultimate source of declining real gross national product since 1974 is a decrease in trade liberalization of the North Korean economy cannot be rejected. The results are more definitive when the sample is split into two subperiods, pre–1974 and post–1974. These findings are generally consistent with the conventional model in which free trade stimulates economic growth.