Some have suggested as a result that Bank Rate be directed not only at meeting the inflation target but also at preventing excessive increases in debt and asset prices. Leaving to one side the feasibility of targeting the latter, the obvious question is how one can meet two objectives with one instrument. The answer of course is by accepting a trade-off between the two objectives. But why should we accept unemployment or high inflation in order to reduce  2  BIS Review 8/2009  financial imbalances? It would be more sensible to use Bank Rate for its traditional task of targeting inflation to maintain a balance between demand and supply in the economy, and to create a new instrument to limit the build up of debt. What is required is an additional policy instrument to stabilise the growth of the financial sector balance sheet. There is an active international debate as to the optimal design of such an instrument, but one way or another it must provide incentives for banks to reduce the volatility of their balance sheet. It is also clear that at the heart of the crisis was the problem identified but not solved at Bretton Woods – the need to impose symmetric obligations on countries that run persistent current account surpluses and not just on countries that run deficits. From that failure stemmed a chain of events, no one of which alone appeared to threaten stability, but which taken together led to the worst financial crisis any of us can recall.
In addition to these conventional unconventional measures there are also unconventional unconventional measures. When credit markets are dysfunctional, as some are at present, targeted purchases by the Bank of England of assets may improve liquidity in markets for those credit instruments. The objective of such purchases would be not only to boost the supply of broad money but also to increase liquidity and trading activity in the markets for those assets. A reduction in the illiquidity premium for a particular credit instrument might help to stimulate issuance by corporate borrowers and the resumption of capital market flows, thus reducing reliance on bank lending. It could also raise the values of assets that are currently under-priced because of high illiquidity premia, helping to strengthen the balance sheets of banks and other financial institutions. Yesterday the Government authorised the Bank of England to conduct such operations, financed by the issue of Treasury Bills, in order to improve the flow of credit to companies. But at some point the Monetary Policy Committee might wish to adopt these unconventional measures as an instrument of monetary policy. In conducting such operations, it is important to choose the markets in which to intervene extremely carefully. There is a fine dividing line between helping to oil the wheels in markets which are temporarily impaired, and artificially supporting markets in which there is no underlying demand.