Should-Read: Peter Lindert: Purchasing Power Disparity before 1914: "The issue has become “when did countries’ contemporaneous purchasing powers diverge?”, not “when did countries’ productivity grow at different rates?”...

...The two questions have different answers, especially before 1914. Using pre-1914 prices to compare real purchasing powers on six continents, this article sketches some historical geography of the departures from the conventional Maddison estimates. One underlying reason for the divergence between projections back from 1990 and direct price comparisons from long ago is that before the great 1870-1914 wave of trade globalization, consumer staples were not traded over great distances, and regions specialized in narrow luxury trade. Inter-continental price ratios for subsistence goods thus varied more widely than since 1914.... Before 1914[,] Northwest Europe was further ahead of Asian countries than earlier measures have shown. The discrepancy stems from a Gerschenkron effect, magnified before 1914 by Engel effects as well as by Balassa-Samuelson. Yet Northwest Europe was behind America and Australia across the nineteenth century, consistent with the same accounting framework but not with Maddison’s estimates.

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