Strategic interactions between monetary and fiscal authorities in a monetary union

In this paper we extend Nordhaus’ (1994) results to an environment which may represent the current European situation, characterised by a single monetary authority and several fiscal bodies. We show that: a) co-operation among national fiscal authorities is welfare improving only if they also co-operate with the central bank; b) when this condition is not satisfied, fiscal rules, as those envisaged in the Maastricht Treaty and in the Stability and Growth Pact, may work as co-ordination devices that improve welfare; c) the relationship between several treasuries and a single central bank makes the fiscal leadership solution collapse to the Nash one, so that, contrary to Nordhaus (1994) and Dixit and Luisa Lambertini (2001), when moving from the Nash to the Stackelberg solution, fiscal discipline no longer obtains. Also in this case we thus argue in favour of fiscal rules in a monetary union.