Bank Equity and Macroprudential Policy

We investigate a new macroprudential policy in a DSGE model with fi?nancial frictions. As Gertler, Kiyotaki and Queralto (2012), we propose to subsidize bank equities. However, our tax rate is different from their policy. The tax rate in our macroprudential policy is proportional to capital ratio gap while it is proportional to the shadow price of bank deposit in Gertler et al. (2012). Our policy has two advantages: Firstly, because bank?s balance sheet structure is observable target for central bank, our policy is more applicable for practical policy design. Secondly, our policy makes individual banks choose to raise more capital. While it tightens the moral hazard constraint, the policy could raise the future value of investment and it shows the modi?fied policy is welfare dominant.