The quality of life experienced by people in the past is one of the most important areas of historical enquiry, and the standard of living of populations is one of the leading measures of the economic performance of nations. Yet how accurate is the information on which these judgments are based? This collection of essays, written by renowned scholars in the fields of labour, wage and welfare history, cogently undermine the validity of the data that have for decades dominated the measurement of these phenomena in Britain, Europe and Asia, and provided the statistical backbone for countless descriptions and analyses of economic development, welfare and many other prime subjects in economic and social history.