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Thirlwall's Law And Krugman's 45-Degree Rule: Mathematically Identical, Mutually Exclusive, Karl Garbacik

Economics Undergraduate Honors Theses

Thirlwall's Law and the 45-degree rule, originally formulated by Krugman, are radically different interpretations of the same statistical regularity. This statistical regularity is that a country's long-run growth rate will approximate to the ratio of that country's export growth to its import elasticity of demand. Thirlwall's Law falls under a Post-Keynesian framework which is primarily a demand-side model. The 45-degree rule relies on a supply-side interpretation, a result of its neoclassical origins. This thesis seeks to answer two questions. The first is, are the members of the Post-Keynesian and neoclassical communities working on each of these theories aware of the …