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Defence date: 26 March 2007 ; Examining board: Prof. Giancarlo Corsetti, EUI, Supervisor ; Prof. Morten Ravn, EUI ; Dr. Jeffrey Campbell, Federal Reserve Bank of Chicago ; Prof. Roel Beetsma, University of Amsterdam ; There is little doubt that fiscal policy plays an important role in business cycle fluctuations; however, the ability of fiscal policy measure to work as a countercyclical stimulus has recently been questioned (see Taylor, 2000), in light of the efficiency and transparency of monetary policy interventions. Far from postulating a definitive answer to the debate, the objective of this dissertation is to contribute to a better understanding of the transmission mechanism of fiscal policy shocks, through their interaction with the consumption behaviour of private agents. The fundamental contribution of this thesis is the introduction of different forms of households' heterogeneity in the analysis of the effects of government expenditure shocks and tax cuts.

This paper updates existing measures of the U.S. fiscal gap to include federal laws up to and including the mid-December 2010 federal fiscal stimulus. It then applies the methodology of generational accounting to establish how the burden of adjustment required to attain fiscal sustainability is shared across generations. We find that the U.S. fiscal and generational imbalances are large under plausible parametric assumptions, and, while not much affected by the financial crisis, they have not improved much by the passing of the Final Healthcare Legislation. We find that, under our baseline sce

We investigate the effects of fiscal policy communication on the propagation of government spending shocks. To this aim, we propose a new index measuring the coordination effects of policy communication on private agents' expectations. This index is based on the disagreement amongst US professional forecasters about future government spending. The underlying intuition is that a clear fiscal policy communication can coalesce expectations, reducing disagreement. Results indicate that, in times of low disagreement, the output response to fiscal spending innovations is positive and large, mainly due to private investment response. Conversely, periods of elevated disagreement are characterised by muted output response.

This paper presents a range of tools and indicators for analyzing fiscal vulnerabilities and risks for advanced economies. The analysis covers key short-, medium- and long-term dimensions. Short-term pressures are captured by assessing (i) gross funding needs, (ii) market perceptions of default risk, and (iii) stress dependence among sovereigns. Medium- and long-term pressures are summarized by (iv) medium- and long-term budgetary adjustment needs, (v) susceptibility of debt projections to growth and interest rate shocks, and (vi) stochastic risks to medium-term debt dynamics. Aiming to cover