Are the effects of fiscal policy really nonlinear? A note

Abstract

Based on a panel data model, Giavazzi, Jappelli and Pagano (2000, European Economic Review 44, 1259–1289) recently found evidence that national saving in OECD countries responds nonlinearly to fiscal policy, the nonlinearity being associated with the size and persistence of the fiscal impulse. The existence of this nonlinearity would have important policy implications because it implies that the short-run costs of a fiscal consolidation program are lower the larger and more persistent it is. However, this paper shows that their finding is not robust, one reason being the inadequacy of the slope homogeneity assumption implicit in their panel model and another reason being their reliance on an implausibly large number of episodes of large and persistent fiscal impulses.