“…With few exceptions, however, these studies use annual data, thereby making it difficult to separate true exogenous shocks to public investment from the endogenous response of public investment to other macroeconomic shocks. Quarterly data are used by Otto and Voss [1996], Voss [2002], Kamps [2004], Mittnik and Neumann [2001], Perotti (2007b), andCreel, Monperrus-Véroni andSaraceno (2007). Using this methodology, Perotti (2007b) finds that in four OECD countries for which the data are available (the US, the UK, Canada and Australia), there is little evidence that a shock to public investment raises GDP in the long run.…”