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This paper examines Wagner's Law of Public Expenditure, which emphasizes economic growth as the fundamental determinant of public sector growth, using time series data drawn from the G7 industrialized countries over the sample period 1960 1993. It presents evidence on both the short- and long-run effects of growth in national income on government expenditure by resorting to recent developments in the theory of cointegrated processes. An attempt is also made in this study to examine if Wagner's Law holds between certain key components of government expenditure and income.

A new test specification of Wagner's Law of Public Expenditure has been formulated. The aim is to disentangle the effects of accelerating and decelerating economic growth on growth in government expenditure. Two alternative proxies for the state of the economy are experimented with. The first defines the current state of the economy by relating it to its historical mean growth rate, while the second defines it relative to a pooled time-series/cross-sectional mean growth rate. This distinction is then explicitly incorporated into an error correction model that parameterizes the bivariate relation between government expenditure and economic growth for alternative OECD country groupings. The results suggest that government expenditure increases less than proportionately with accelerating economic growth and decreases more than proportionately with decelerating economic growth. There is only a limited support for Wagner's Law.

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