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Another conclusion is that interest-rate policy is not enough to achieve financial stability. Other instruments like supervision and regulation, including appropriate bank resolution regimes, should be the first choice for financial stability. In many countries, the responsibility for these instruments rests on authorities other than the central bank. Generally, to the extent financial instability depends on specific distortions, good regulation should aim to attack these distortions as close to the source as possible. To counter the observed procyclicality of existing regulation, macro-prudential regulation that is contingent on the business cycle and financial indicators may need to be introduced to induce better financial stability. Possible macro-prudential regulation includes variable capital, margin, and equity/loan requirements. As expressed by Bean (2009), “the best approach is likely to involve a portfolio of instruments”. 14 More generally, what is the relation between financial stability and monetary policy? Financial stability is an important objective of economic policy. A possible definition of financial stability is a situation when the financial system can fulfil its main functions (of submitting payments, channelling saving into investment and providing risk sharing) without disturbances that have  12  Kohn (2008), after extensive discussion, concludes that there is insufficient evidence that low interest rates would have contributed much to the house-price boom and that higher interest rates would have had much dampening effect on it. 13  The relationship for the Euro area countries is less weak, but for reasons explained by Bernanke (2010) it is potentially overstated.