This paper's model is capable of explaining the empirical evidence on the mixed growth-rate effects of fiscal and monetary policies and a nonlinear inflation-growth relation. When monopoly power in the product market is strong/weak, an increase in the money growth rate or the income tax rate promotes/reduces the output growth rate through lowering/ raising the equilibrium gross markup and increasing/reducing the net rate of return on capital. The fact that money can generate a positive growth rate effect allows for the appearance of a nonlinear inflation-growth relation. Such a nonlinear relation cannot be caused by changes in the income tax rate.
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