This paper provides empirical evidence for interdependence of jurisdictions' tax policies. We study tax policy interdependence between municipalities in the economically integrated European Metropolitan Area Frankfurt/Rhein-Main, that spreads across two German states, Hesse, and...

Should a subset of member states of a federation be allowed to form a sub-union on some policy issue? When centralization is not politically feasible, allowing an enhanced cooperation agreement among a subset of countries permits the latter to gain benefits which would otherwise be lost....