The persistence of government expenditure shocks and the effect of monopolistic competition on the fiscal multiplier

In this paper, we demonstrate that the influence of monopolisticcompetition in the product market on an economy's impact responseto fiscal shocks depends on the persistence of these shocks.While short-lived increases in lump-sum financed governmentexpenditure have a stronger effect on labor supply if pricesare above marginal costs, the response of employment decreasesin the markup if shocks are highly persistent. However, we alsoshow that, while the impact response of labor supply to temporarygovernment expenditure shocks may be reduced by monopolisticcompetition, the fiscal multiplier is always higher if firmshave market power.