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The hypothesis that economic growth has been the principal source of mortality decline during the 20th century in the United States is investigated. This hypothesis is consistent with the large epidemiological literature showing socioeconomic status to be inversely related to health status and unemployment associated with elevated morbidity and mortality rates. Despite evidence over many years showing economic growth, over at least a decade, to be fundamental to mortality rate declines and unemployment rates showing lagged, cumulative effects on mortality rate increases, a recent paper argues that the impact of economic growth is to increase the mortality rate.

Commentary: Economic growth is the basis of mortality rate decline in the 20th century—experience of the United States 1901–2000