The economic cost of capital: a VECM approach for estimating and testing the banking sector’s response to changes in capital ratios

The Basel III/CRD IV reforms to the banking system following the financial crisis of 2008–09 required banks to raise significantly both the quality and quantity of capital on their balance sheets. This econometric study provides evidence of both the long and short-term implications for ongoing activity in the UK economy of a change in the aggregate proportion of bank capital funding. Authors, Sebastian de-Ramon and Michael Straughan, find that, in response to changes in their capital funding, banks change credit spreads applied to private non-financial corporate borrowers to a greater extent than for household borrowers in the short term, but equalise these changes in the longer term. The short-term impact reflects banks’ desire to adjust their capital ratios through changes to the value of their risk-weighted assets by restricting the flow of lending to higher-risk sectors to a greater extent than to lower-risk sectors.

Straughan and de-Ramon also find that after recent regulatory reforms banks may have modified their price-setting behaviour somewhat. They develop a vector error correction model of these effects with an innovative non-standard estimation of the short-term coefficients. Using this approach, they are able to: (i) test hypotheses about the short-term and long-term responses to changes in the aggregate mix of bank capital funding; (ii) test hypotheses about the responses of the non-financial corporate and household sectors; and (iii) enhance the accuracy of the short-term dynamics and the accuracy of the macroeconomic simulations of the effect of increasing bank capital.

Read more here: Bank of England staff working paper no. 663

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