Global lending conditions and international coordination of financial regulation policies

Using a model of strategic interactions between two countries, I investigate the gains to international coordination of financial regulation policies, and how these gains depend on global lending conditions. When global lending conditions are determined non-cooperatively, I show that coordinating regulatory policies leads to a Pareto improvement relative to the case of no cooperation. In the non-cooperative equilibrium, one region - the core - determines global lending conditions, leaving the other region - the periphery - in a sub-optimal situation. The periphery then tightens regulatory policy to reduce the cost of sub-optimal lending conditions. Yet, in doing so, it fails to internalise a cross-border externality: tightening regulatory policy in one region limits ex ante borrowing in the other region, which increases the cost of sub-optimal lending conditions for the periphery. The equilibrium with cooperative regulatory policies can then improve on this outcome as both regions take into account the cross-border externality and allow for larger ex ante borrowing, ending in a lower cost of suboptimal lending conditions for the periphery.