masaaki shirakawa : the importance of fiscal sustainability – preconditions for stability in the financial system and in prices remarks by mr masaaki shirakawa, governor of the bank of japan, at the bank of france financial stability review launch event, washington dc, 21 april 2012. * * * relationship between fiscal sustainability and central banks the mission of a central bank is to contribute to sustained growth of the economy by maintaining public confidence in money, and price stability and financial system stability are two facets of this mission. fiscal sustainability is an important element that has a fundamental impact on both. according to conventional wisdom, when the government loses its credibility with respect to the sustainability of government debt and does not make enough effort to regain it, this ultimately leads to either inflation or a default on the debt. to put this differently, it is often said that a central bank comes to face a tradeoff between price stability and financial system stability. however, since both are essential preconditions for sustained economic growth, it is not at all meaningful to consider which of the two we should choose. what is crucially important is to prevent the economy from getting into such a tradeoff in the first place ; for that reason, fiscal sustainability itself is an essential precondition for the proper functioning of a central bank. let me now elaborate on this point. in normal times, government bonds are traded in large volumes in financial markets and used as collateral, reflecting their characteristics as safe assets. they are also held by financial institutions as liquidity buffers and investment assets. as such, a heightened risk for government debt default is likely to lead to instability in the financial system, through an increase in the liquidity risk and the capital loss of financial institutions. in such a situation, a central bank may be called into action as a “ lender of last resort ” by providing liquidity in order to maintain the stability in financial markets and the financial system, and such operations are expected to be effective at least in the short term. taking an example from europe, the ecb ’ s long - term refinancing operations ( ltros ) have helped to restore calm in financial markets. we are fully aware of the importance of such operations, but one has to also keep in mind that they can only be used to “ buy time. ” a central bank ’ s operations to “ buy time ” may help the government to garner time to build a public consensus on the need for fiscal consolidation

and fiscal areas. at the moment, such expectations are not firmly backed by concrete reform plans ; the public therefore restrains spending on concerns over future fiscal developments, and this constitutes one factor behind sluggish economic growth and mild deflation. if this is indeed the case, the experience of japan indicates a possibility that a cumulative increase in government debt, combined with weak growth expectations, might generate deflationary pressures as long as the government retains its credibility with respect to eventual fiscal consolidation. in other words, this is the situation before the loss of fiscal sustainability leads to either inflation or a default on the debt. behind the decline in growth expectations and the cumulative increase in government debt are the aging of the population and the failure of the japanese economy to adjust to it in a flexible manner. there is a limitation, at least in the short run, to changing the demographic trend itself. therefore, given that the rapid aging of the population is likely to continue, strengthening the growth potential through productivity improvements and making the fiscal structure sustainable in the situation of an aging population are the most important challenges for japan in terms of maintaining macroeconomic stability over the medium to long term. bis central bankers ’ speeches