This paper examines credit market policies under pecuniary externalities induced by collateral constraints. Pigouvian taxes/subsidies on debt or savings are derived as Ramsey-optimal policies. Firstly, prudential (ex-ante) debt taxes can restore constrained efficiency. Secondly, when policies...

This paper examines financial regulation and distortionary taxes in a heterogeneous-agents economy with pecuniary externalities induced by a collateral constraint. Limiting the loan-to-value ratio benefits only few unconstrained borrowers and reduces ex-ante social welfare. A Pigouvianstyle...

This paper studies the effects of harmonizing collateral policy in a monetary union. In 2007, the European Central Bank replaced national collateral lists with a single list specifying which assets euro area banks can pledge as collateral. Banks holding newly eligible assets experience a...