Optimal Bank Capital
AbstractThis paper reports estimates of the long-run costs and benefits of banks funding more of their assets with loss-absorbing capital, or equity. Measuring those costs requires careful consideration of a wide range of issues about how shifts in funding affect required rates of return and on how costs are influenced by the tax system; it also rqeuires a clear distinction to be drawn between costs to individual institutions (private costs) and overall economic (or social) costs. Without a calculation of the benefits from having banks use more equity no estimate of costs - however accurate - can tell us what the optimal level of bank capital is. We use empirical evidence on UK banks to assess costs; we use data from shocks to incomes from a wide range of countries over a long period to assess risks to banks and how equity funding (or capital) protects against those risks. We find that the amount of equity capital that is likely to be desirable for banks to use is very much larger than banks have used in recent year and also higher than targets agreed under the Basel III framework.
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Bibliographic InfoPaper provided by Monetary Policy Committee Unit, Bank of England in its series Discussion Papers with number 31.
Length: 53 pages
Date of creation: 01 Apr 2011
Date of revision:
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More information through EDIRC
Banks; capital regulation; capital structure; cost of equity; leverage; Modigliani-Miller;
Other versions of this item:
- G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
- G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation
This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-11-01 (All new papers)
- NEP-BAN-2011-11-01 (Banking)
- NEP-CBA-2011-11-01 (Central Banking)
- NEP-CFN-2011-11-01 (Corporate Finance)
- NEP-REG-2011-11-01 (Regulation)
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