This ambitious book seeks both to revive and revise the idea of 'functional finance'. Followers of this doctrine believe that government budgets should concentrate solely on their macroeconomic impact on the economy, rather than reflecting a concern for sound finance and budgetary discipline....

We define the notion of 'de facto fiscal space' of a country as the inverse of the outstanding public debt relative to the de facto tax base, where the latter measures the realized tax collection, averaged across several years to smooth for business cycle fluctuations. We apply this concept to...