Stefan Homburg has a new paper on this topic. I don’t quite get how the model hands together, but still the effort alone strikes me as very real progress in this area:
Japan has been in a benign liquidity trap since 1990. In a benign liquidity trap, interest rates approach zero, prices decline, and monetary policy is ineffective but output and employment perform decently. Such a pattern contradicts traditional macro theories. This paper introduces a monetary general equilibrium model that is compatible with Japan´s performance and resolves puzzles associated with liquidity traps. Possible conclusions for Anglo-Saxon countries and eurozone members are also discussed.