Barro (1990)constitutes one of the first attempts at endogenising the relationshipbetween growth and fiscal policies. He distinguishes four categories of public finances: productive vs. non-productive expenditures and distortionary vs. non-distortionary taxation. We present a simple sketch of the Barro model in order to show that both productive public expenditure and distortionary taxation can affect long-run output growth. We assume that the population of consumers is normalised to one. Consumers both consume and produce final output according to the following production function:
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