4Non-technical summary 5

This paper focuses on the effects of fiscal policy in Spain analysed in a VAR context. Fiscal shocks are found to involve significant effects on GDP, private consumption, private investment, interest rates and prices. Non-Keynesian effects are observed. Moreover, evidence on the channels highlighted in the literature for such effects to arise is found, notably the effects of permanent income on consumption and investment on the demand side, coupled with the response of the equilibrium wage on the supply side affecting entrepreneurial profits and investment. The response of interest rates seems to reinforce both effects. Furthermore, the different readings of spending or taxes do not affect macroeconomic variables homogeneously.

The success of a consolidation in reducing the debt ratio depends crucially on the value of the multiplier, which measures the impact of consolidation on growth, and on the reaction of sovereign yields to such a consolidation. We present a theoretical framework that formalizes the response of the public debt ratio to fiscal consolidations in relation to the value of fiscal multipliers, the starting debt level and the cyclical elasticity of the budget balance. We also assess the role of markets confidence to fiscal consolidations under alternative scenarios. We find that with high levels of public debt and sizeable fiscal multipliers, debt ratios are likely to increase in the short term in response to fiscal consolidations. Hence, the typical horizon for a consolidation during crises episodes to reduce the debt ratio is two-three years, although this horizon depends critically on the size and persistence of fiscal multipliers and the reaction of financial markets. Anyway, such undesired debt responses are mainly short-lived. This effect is very unlikely in non-crisis times, as it requires a number of conditions difficult to observe at the same time, especially high fiscal multipliers.

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4Non-technical summary 5