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Britain’s 1919 introduction of a 48-hour week for industrial workers has been highlighted as a key factor depressing its relative labour productivity. This largely ignores both any potential offset to lower hours from higher hourly productivity and the fact that the 48-hour week was also introduced in almost all other industrialized nations (generally involving substantially greater reductions in hours). We examine the international context and the short-term impact on British productivity, focusing on three major export industries–coal, cotton, and iron and steel. Britain did not suffer any significant relative productivity loss in these industries, while reduced working hours are shown to have been partially compensated for by higher hourly productivity.