The macroeconomics of unbalanced growth and the expanding public sector: Some simple tests of a model of government growth

A now classic model of public sector growth is Baumol's (1967) ‘Macroeconomics of Unbalanced Growth’. That model implies that one cause of public sector expenditure growth is a low or zero rate of productivity growth in the public sector relative to the private sector. Previous studies have tested, and partially confirmed, the Baumol hypothesis by computing productivity indices for various public sector activities. In this paper I attempt to test that model in a more direct manner. The unbalanced growth model is used to predict growth rates of per capita government expenditures, government's share of GNP and the pattern of government expenditure growth. These predictions are compared with observed growth rates of aggregate government expenditures. The model predicts the growth rate aggregate government expenditures, the growth rate of government's share of GNP, and the pattern of government expenditure growth reasonably well, and the data tend to support the Baumol model.