With the spectre of a recession looming in the eurozone (and elsewhere), the policy question arises as to how much leeway do the fiscal authorities in the eurozone have to follow counter-cyclical fiscal policies aimed at providing some stimulus to the economy.

The cyclically adjusted budget balance (CAB) plays a key role in the EU fiscal surveillance framework. It started off in a supporting role in the shadow of the headline defi cit and, before long, turned into the linchpin of the rules of the Stability and Growth Pact. The steep ascent was driven...