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⭐ESTABILIDAD FINANCIERA 05/2013 N.º 24
ESTABILIDAD FINANCIERA 05/2013 N.º 24
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Salvador Lorenzo Páez Macías
1 ESTABILIDAD FINANCIERA 05/2013 N.º 242 3 ESTABILIDAD FINANCIERA MAYO 20134 5 ESTABILIDAD FINANCIERA MAYO 2013 Número 246 ESTABILIDAD FINANCIERA es una revista semestral que tiene como objetivo servir de plataforma de comunicación y diálogo sobre cualquier aspecto relativo a la estabilidad financiera, con especial dedicación a las cuestiones de regulación y supervisión prudenciales. ESTABILIDAD FINANCIERA es una publicación abierta, en la que, junto a contenidos institucionales, tienen cabida colaboraciones personales de investigadores y profesionales del sector financiero, que serán sometidas a un proceso de evaluación anónima. Los trabajos y comentarios sobre la revista deberán enviarse a la dirección de correo electrónico Consejo Editorial de ESTABILIDAD FINANCIERA: Javier Aríztegui (Banco de España), Juan Ayuso (Banco de España), Santiago Carbó (Bangor University, Reino Unido), Gonzalo Gil, Rafael Repullo (CEMFI), Jesús Saurina (Banco de España), Vicente Salas (Universidad de Zaragoza) y Julio Segura. Secretaria del Consejo: Montserrat Martínez Parera (Banco de España). Los artículos firmados son responsabilidad exclusiva de sus autores y no reflejan necesariamente la opinión del Banco de España. Se permite la reproducción para fines docentes o sin ánimo de lucro, siempre que se cite la fuente. Banco de España, Madrid, 2013 Autores colaboradores externos: David Aikman Andrew G. Haldane Thomas F. Huertas Sujit Kapadia Alfredo Martín-Oliver ISSN: (edición electrónica)7 ÍNDICE Operationalising a macroprudential regime: goals, tools and open issues 9 David Aikman, Andrew G. Haldane and Sujit Kapadia Banking Union 31 Thomas F. Huertas Requerimientos prudenciales y ajustes valorativos por riesgo de contrapartida en derivados OTC: situación actual y perspectivas 45 Francisco Gil y Francisco Manzano Covered bonds: the renaissance of an old acquaintance 67 Rebeca Anguren Martín, José Manuel Marqués Sevillano and Luna Romo González Top-down stress tests as a macro-prudential tool: methodology and practical application 89 Carlos Pérez Montes and Carlos Trucharte Artigas Financial integration and structural changes in Spanish banks during the pre-crisis period 109 Alfredo Martín-Oliver8 .9 OPERATIONALISING A MACROPRUDENTIAL REGIME: GOALS, TOOLS AND OPEN ISSUES David Aikman, Andrew G. Haldane and Sujit Kapadia (*) (*) David Aikman, Andrew G. Haldane and Sujit kapadia, Bank of England. The authors would like to thank Rafael Repullo for his excellent comments on an earlier draft of this paper. This article is the exclusive responsibility of the authors and does not necessarily reflect the opinion of the Banco de España or the Bank of England.10 11 OPERATIONALISING A MACROPRUDENTIAL REGIME: GOALS, TOOLS AND OPEN ISSUES 1 Introduction Since the early 1970s, the probability of systemic crises appears to have been rising. The costs of systemic crises have risen in parallel. The incidence and scale of systemic crises have risen to levels never previously seen in financial history [Reinhart and Rogoff (2011)]. It has meant that reducing risks to the financial system as a whole systemic risks has emerged as a top public policy priority. The ongoing financial crisis is the most visible manifestation of this trend. Five years on from its inception, the level of real output in each of the major industrialised economies remains significantly below its pre-crisis path (Chart 1). In cumulative terms, crisis-induced output losses have so far reached almost 60 %, over 40 % and over 30 % of annual precrisis GDP in the UK, Euro-area and US respectively. 1 With the benefit of hindsight, the pre-crisis policy framework was ill-equipped to forestall the build-up in systemic risk which generated these huge costs. Monetary policy internationally was aimed at balancing nominal demand in line with the supply capacity of the economy. And microprudential regulation meanwhile focused on the health and conduct of individual financial institutions. This approach appeared to work well for some time we entered a Great Moderation. 2 Certainly, demand and inflation were stable and there were few failures of financial institutions. But at the same time, something dramatic was happening within the financial sector. Global banks balance sheets doubled between 1990 and In some countries, such as the UK and Spain, the ballooning of balance sheets was more dramatic still. As financial exuberance took hold, credit became too cheaply priced. Latent financial vulnerabilities began to emerge. To some extent, these emerging fault-lines reflected fundamental weaknesses in the microprudential regime. In particular, regulatory limits on banks leverage ratios were set 1 It could plausibly be argued that these output costs are an overstatement of the damage caused by the financial crisis as the pre-crisis level may have been unsustainable. 2 See Blanchard and Simon (2001) and Bernanke (2004). THE SEVERE AND PERSISTENT REAL COSTS OF FINANCIAL CRISES CHART 1 UNITED KINGDOM EURO AREA UNITED ESTATES Index (2004=100) % Index (2004=100) Index (2004=100) % % SOURCE: Authors calculations. BANCO DE ESPAÑA 11 ESTABILIDAD FINANCIERA, NÚM. 2412 A SELECTION OF SYSTEMIC RISK FRAMEWORKS AROUND THE WORLD TABLE 1 United Kingdom Financial Policy Committee (FPC) Governance Structure Mandate Powers Chair: Governor of the Bank of England 10 voting members (5 from BoE, including head of prudential regulator; head of conduct regulator; 4 external members), one non-voting HM Treasury representative Meets quarterly Protect and enhance the resilience of the UK nancial system Subject to this, support the government s economic objectives including for growth and employment Cannot take actions that would be detrimental to medium-to-long term growth Direction powers over Countercyclical Capital Buffers and Sectoral Capital Requirements Comply-or-explain Recommendation powers over prudential and conduct regulators Recommendations (not comply-or-explain) to other bodies (eg on regulatory perimeter) Measures cannot be directed at individual institutions United States Financial Stability Oversight Council (FSOC) Chair: US Secretary of the Treasury 10 voting and 5 non-voting members from Federal Reserve and supervisory agencies Meets at least quarterly Identify and respond to emerging threats to nancial stability Promote market discipline, eliminate bailout expectations Recommendations to the supervisory authorities on heightened prudential standards Designation of systemically important non-bank nancial institutions and nancial market utilities Reporting to Congress on regulatory gaps European Union European Systemic Risk Board (ESRB) Chair: ECB President 37 voting members, including central bank governors, and 28 non-voting members from supervisory agencies Meets quarterly Prevent or mitigate systemic risks to the EU nancial system Contribute to smooth functioning of the internal market and sustainable nancial sector growth Systemic risk warnings and non-binding recommendations to European member states Germany German Financial Stability Commission (Ausschuss für Finanzstabilität) Chair: The Federal Minister of Finance (or deputy) Three representatives from the Ministry of Finance, three from the Deutsche Bundesbank; and three from the BaFin. Non-voting role for the chairman of the FMSA Meets quarterly Tasks of the Commission include: Consideration of decisive issues for nancial stability Strengthening cooperation in a crisis between institutions represented on the Commission Warnings and recommendations to the German government, the BaFin, or any other public sector institution within Germany. Recipients obliged to respond within an appropriate timeframe. Legal right to request data (forthcoming) both from reporting entities and other public authorities France Financial Stability Council (Conseil de stabilité nancière CSF) Chair: Finance Minister 9 members (Banque de France Governor, the Secretary General and deputy of the prudential supervisor (ACP), the head of the markets regulator, the head of the accounting standards authority and three external independent members) Maintain the stability of the nancial system and guaranteeing that the nancial sector makes a sustainable contribution to economic growth Ensure co-operation and exchange of information among its members Recommendations to institutions represented on the CSF (which may be published) to prevent threats to nancial stability. Recipients must inform the CSF of the actions taken in response At the proposal of the Governor of the BdF, de ning capital requirements on exposures in France and outside the EEA At the proposal of the Governor of the BdF, stipulating criteria or conditions for loans issued by banks Switzerland The Swiss National Bank has the right to submit proposals to the Federal Council, following consultation with the Swiss Financial Market Supervisory Authority (FINMA) Decision-making power rests with the Federal Council Increase the resilience of the banking sector and the overall economy against risks posed by excessive credit growth Counter excessive credit growth and price rises Sector-speci c countercyclical capital buffer targeting residential mortgage lending Sweden Council for cooperation on macroprudential policy Chair: Governor of the Riksbank 6 members (a Deputy Governor of the Riksbank and its Head of Financial Stability, the Director General, Chief Economist and Chief Legal Council of Finansinspektionen, the microprudential supervisor) Meets at least twice a year Discuss both authorities assessments of systemic risks, appropriate prevention measures and issues relating to development of macroprudential policy in general Not de ned SOURCES: Bank of England, Financial Stability Oversight Council, European Systemic Risk Board, Bundesbank, Banque de France, Swiss National Bank and Riksbank. at levels which, with hindsight, were far too low. 3 But there are also limits to what prudential regulation could reasonably achieve as long as it was static and calibrated to institution-specific balance sheets. With this focus, the build-up of leverage and 3 See Wellink (2011) for a summary of weaknesses in the pre-crisis microprudential regime. Consistent with regulatory definitions, this paper defines leverage ratios by dividing the relevant measures of capital by assets (e.g. a leverage ratio of 4%) rather than the reverse (e.g. a leverage ratio of 25 times). But the discussion uses the standard English language interpretation of associating rising levels of leverage with greater indebtedness under the definition used here, this is equivalent to a falling leverage ratio. BANCO DE ESPAÑA 12 ESTABILIDAD FINANCIERA, NÚM. 2413 maturity mismatch across the financial system, and growing interconnectedness within it, was under-emphasised. In response, a broad consensus has emerged internationally over the past few years on the need to introduce macroprudential regulation. 4 In essence, this new approach seeks to ensure that regulatory rules are attuned to risks arising across the financial system as a whole. Put differently, it aims to plug the gap between macroeconomic policy on the one hand and microprudential regulation on the other a gap through which the largest crisis in a generation fell. New macroprudential regimes are being put in place around the globe. For example, in the United Kingdom, the Financial Services Act (2012) creates a Financial Policy Committee (FPC) at the Bank of England, with broad powers to make comply-or-explain recommendations and control over a set of specific macroprudential tools. In the US, the Financial Stability Oversight Council (FSOC) and in the Euro-area the European Systemic Risk Board (ESRB) have been set up with broadly similar objectives. Macroprudential frameworks are being established in a number of other countries too, including in Switzerland, France and Germany to name but a few. Table 1 summarises a selection of them. 5 In this paper, we provide an overview of the progress made in making macroprudential regimes operational. Section 2 sets out an analysis of the sources of systemic risk. Section 3 uses this as the basis for a taxonomy of potential macroprudential policy instruments. Section 4 provides a case study of how one such instrument the countercyclical capital buffer might be made operational. The material in this section draws heavily on the analysis presented in Bank of England (2013). Section 5 concludes with a discussion of open issues, of which there are many. 2 Fundamental sources of systemic risk In designing a public policy framework for tackling systemic risk, a natural first step is to identify potential sources of such risk. In this respect, economists have often found it analytically convenient to distinguish two manifestations: 6 First, time-varying or cyclical risks whose magnitude at any point in time depends on the amount of risk the financial system as a whole takes, relative to its available capital and liquidity resources; and Second, cross-section or structural risks whose magnitude depends on the network of connections between financial institutions and the distribution of risk across financial market participants. 2.1 TIME-VARYING OR CYCLICAL RISKS There is a strong collective tendency for financial firms, companies and households to overexpose themselves to risk in the upswing of a credit cycle and to become overly riskaverse in a downswing. This pro-cyclicality has a variety of underlying behavioural causes, including myopia about risk 7 and herding in financial markets. 8 The result is a feast-or-famine problem, with credit plentiful when times are good, but severely rationed when they are bad. 4 See inter alia Bank of England (2009, 2011), FSB-IMF-BIS (2011), De Larosière (2009), Van Rompuy (2012), G30 (2010), HM Treasury (2011), CGFS (2010), IMF (2011), Hanson, Kashyap and Stein (2011). 5 Nier et al. (2011) set out some of the strengths and weaknesses of alternative institutional frameworks for conducting macroprudential policy. 6 This distinction draws on Borio and Crockett (2000) and is consistent with those adopted by others in the literature, including Bank of England (2009, 2011), CGFS (2010), Group of Thirty (2010), IMF (2011) and FSB/IMF/BIS (2011). 7 See Guttentag and Herring (1986), Herring (1998), Haldane (2009a), Gennaioli, Schleifer and Vishny (2012). 8 On the theory of herding in financial markets, see Avery and Zemsky (1998); Lakonishok et al. (1992) test its empirical relevance. Bikhchandani and Sharma (2001) provide an overview of the literature. BANCO DE ESPAÑA 13 ESTABILIDAD FINANCIERA, NÚM. 2414 MEDIUM-TERM CYCLE IN REAL GDP AND REAL CREDIT FOR THE UNITED KINGDOM CHART 2 % 20 % 15 % 10 % 5 % 0 % -5 % -10 % -15 % -20 % rgdp rloans SOURCE: Aikman, Haldane and Nelson (2010). This credit cycle is not just disruptive in its own right. Historically, it has also tended to propagate crises. Credit booms have sown the seeds of subsequent credit crunches for many centuries. The work of Minsky (1986) and Kindleberger (1989) were both attempts to make sense of these regular patterns in the relationship between credit growth and crises, drawing on detailed case studies of past financial crises. Schularik and Taylor (2012) have recently provided some econometric support for this link between credit and crises. The authors compile a dataset of financial variables from 12 developed economies over almost 140 years. They find credit growth to be the single best predictor of financial instability over this period. For example, according to their estimates, a one standard deviation change in real loan growth raises the probability of a crisis by between two and three percentage points, relative to an in-sample crisis frequency of just under 4 per cent. Dell Ariccia et al. (2012) report similar findings using a dataset of 170 countries back to the 1960s. They find that roughly two-thirds of all credit booms are followed either by a banking crisis or by a period of sub-par economic growth. 9 Aikman, Haldane and Nelson (2010) use the Schularik and Taylor dataset to document the empirical properties of credit cycles. As Chart 2 illustrates for the UK, bank credit exhibits a remarkably regular pattern of cyclical swings. A broadly similar pattern is evident in most other countries. Relative to the typical business cycle, two features of the credit cycle stand out. First, its average duration is over 10 years, far longer than the typical business cycle. This makes it harder to distinguish structural and cyclical shifts in credit: a lengthy cyclical credit boom may look like a permanent technological shift, as during the run-up to the present crisis. Second, credit cycles are also distinct from business cycles in their amplitude. The amplitude of credit cycles is roughly five times that of fluctuations in GDP at conventional business cycle frequencies. Cycles in asset prices have higher amplitude still. Drehmann, Borio and Tsatsaronis (2011) report similar findings. This suggests that pro-cyclicality in the financial sector may be an important amplifier of the business cycle. The recent credit cycle has been particularly severe and synchronised internationally. In 2006, private sector credit across the United Kingdom, United States and Euro-area rose by around 10 %. In some sectors, such as real estate, it was larger still. In the United Kingdom, 9 See also Borio and Lowe (2002), Mendoza and Terrones (2008), Reinhart and Rogoff (2009). BANCO DE ESPAÑA 14 ESTABILIDAD FINANCIERA, NÚM. 2415 the stock of credit extended to commercial real estate companies doubled between 2002 and 2008; in Spain and Ireland, construction accounted for 20 per cent of the level of GDP in When the bubble burst, the flow of private credit collapsed. These credit booms and busts tend, historically, to have been amplified by four factors, all of which were present in the current crisis. First excessive leverage, especially in the banking system. When a credit boom is funded by banks operating at low levels of capital, the consequence is a heightened risk of subsequent banking sector distress when imbalances unravel. Leverage was a very important amplifier of both the recent credit boom and bust. A comparison with the late-1990s technology bubble is instructive here. The collapse of dotcom shares led to significant market volatility, but it was the wave of defaults on telecom debt that threatened banking stability. 10 A second factor that intensifies credit booms and busts is maturity transformation. Funding long-term assets with short-term liabilities can be socially efficient and welfare-improving. 11 But taken to excess, this can expose banks to the risk of runs and the possibility that they might need to contract wholesale lending, hoard liquidity or sell assets at depressed market prices to meet actual or prospective withdrawals. Prior to the crisis, many banks reduced their holdings of liquid assets and became increasingly reliant on funding at shorter maturities. This amplified the credit cycle, with the growth of bank balance sheets highly correlated with the proportion of funding sourced from short-term wholesale deposits. 12 When the crisis hit, flighty sources of funding disappeared, putting further pressure on banks liquidity and solvency. A third factor is intra-financial system activity. Links between financial institutions can help manage risk and distribute funds to where they can be most efficiently deployed. But cyclicality in such interconnectedness can also fuel credit booms. For example, in the precrisis period, securitisation was perceived to have dispersed risk around the system. But it reduced incentives for banks to screen and monitor lending, exacerbating overborrowing. 13 It also lengthened the intermediation chain, masking a significant increase in leverage and maturity transformation across the system. 14 Fourth, the credit cycle can be amplified by a relaxation of the terms and conditions on transactions in financial markets. In the pre-crisis period, lending spreads fell for both the household and corporate sectors, while the share of new mortgages extended at high LTV and LTI ratios rose sharply. 15 This contributed to the bubble in real estate lending in a number of countries, including the US, UK and Spain. Terms in wholesale borrowing markets also became progressively more lax, as did margining requirements on secured financing and derivatives transactions. The reversal of these trends was a major contributory factor to the collapse in interbank markets and the credit crunch. 2.2 CROSS SECTION OR STRUCTURAL RISKS The systemic consequences of shocks to asset prices and activity also depend importantly on structural features of the financial sector. These include the distribution or concentration 10 See Mishkin (2008). 11 See Diamond and Dybvig (1983). 12 Financial Services Authority (2009). 13 Consistent with this, Keys et al. (2010) observe that low documentation subprime mortgage loans with FICO scores just above 620 defaulted 20% more frequently than their counterparts with scores just below 620 the former category were significantly easier to sell to investors via securitisations than the latter. 14 See Hellwig (1995). 15 For example, in the United States typical LTV ratios rose prior to the crisis, with higher LTV ratios subsequently associated with higher default rates. BANCO DE ESPAÑA 15 ESTABILIDAD FINANCIERA, NÚM. 2416 of risk across the financial system and the opacity (lack of information) and complexity (difficulty of assessing information) of financial products, institutions and the connections between them. All of these ingredients were important in the run-up to the crisis. When risk is concentrated in a small number of institutions or markets, or when the provision of financial services is highly concentrated, the system is likely to be more vulnerable than if risks and the provision of services are more evenly distributed. As illustrated by the experiences of AIG and Lehman Brothers in the current crisis and Long-Term Capital Management and Credit Anstalt further back in history, distress or failure of a systemically important entity that is too big to fail can trigger spillovers to financial institutions or the wider economy which far exceed the contagion generated by the collapse of peripheral players. 16 In other words, there are network externalities associated with the failure of key nodes in the financial system. These externalities arise because individual institutions or infrastructure providers typically fail to take sufficient account of the effects of their own actions, or failure, on others within the system. This leads to under-insurance against systemic risk. Systemic significance may also give rise to expectations of state support, which further distort perceptions of risk by lowering the cost of funding that such institutions face. 17 This supported rapid balance sheet expansion in the lead-up to the crisis. When such institutions subsequently failed during the crisis, they were provided state support to cushion their contagious consequences. In the UK, US and the Euro-area, state support of various types to financial institutions peaked at over 50 % of GDP. Systemic risk can also be generated by the opacity and complexity of institutions, markets and financial instruments. These factors hinder the effective operation of market discipline to limit risk and potentially contribute to perception-driven contagion. Complexity also makes financial institutions more difficult to resolve. Pre-crisis, financial innovation spawned many examples of such complexity. For example, uncertainty over off-balance sheet exposures and banks widely differing valuations of the same complex structured products led investors to lose faith in published balance sheets and to reduce their appetite for complex financial products and institutions. Innovation linked to complex trading strategies may also contribute to market stress. For example, high-frequency trading strategies have been highlighted for their role in amplifying the 6 May 2010 US flash crash. There is evidence that such strategies can drive withdrawals of liquidity, amplifying stress. More generally, algorithmic trading strategies can lead to destabilising feedback loops, which in turn may lead to sharp price falls, possibly across a wide range of market venues. 3 Tools to tackle systemic risk Given these different sources of systemic risk, a range of different types of macroprudential tools may be needed to tackle them. 18 Prospective macroprudential tools can be roughly categorised three ways: 19 Those that operate on financial institutions balance sheets; Those that affect the terms and conditions on financial transactions; Those that influence market structures. 16 See Haldane (2009b), Gai et al. (2011) and Arinaminpathy et al. (2012). 17 Noss and Sowerbutts (2012) quantify the value of this implicit subsidy for UK banks. 18 See also Hanson, Kashyap and Stein (2011) and Berntsson and Molin (2012). 19 See Bank of England (2011). BANCO DE ESPAÑA 16 ESTABILIDAD FINANCIERA, NÚM. 2417 POTENTIAL MACROPRUDENTIAL INSTRUMENTS TABLE 2 Key Ampli cation Channels/ Tools Time-varying risk Leverage Intra- nancial system activity Maturity transformation Cross-sectional risk: distribution of risk; opacity; complexity Balance-sheet tools Countercyclical capital buffers Maximum leverage ratios Limits on exposures to particular asset classes Sectoral capital requirements targeted at real economy lending Dynamic provisioning Stress testing Sectoral capital requirements targeted at intra- nancial system activity Time-varying or sectoral liquidity buffers Time-varying liquidity buffers (e.g. Liquidity Coverage Ratios; Net Stable Funding Ratios; Core Funding Ratios; loan-to-deposit ratios) Sectoral liquidity buffers Limits on particular sources of funding or funding instruments Capital/liquidity add-ons for systemically important nancial institutions (SIFIs) Large exposure / liability limits Institutional structure (e.g. ring-fencing) Terms and conditions of transactions Loan-to-value, loan-to-income and debt-to-income restrictions Haircut / margin restrictions Market structures Remuneration practices Use of central counterparties Use of central counterparties Design and use of trading venues (including circuit breakers ) Disclosure requirements SOURCE: Bank of England (2011). The first two of these are primarily designed to tackle cyclical risks. The corresponding tools are likely to be time-varying in nature, ie tightened during periods of exuberance and relaxed when risks have receded or crystallised. The third category of tools is primarily geared towards cross-sectional risks and so would tend to be permanent, or at least durable, in nature. Table 2 lists some frequently discussed tools which fall into these various categories. 20 Balance sheet tools include maximum leverage ratios, countercyclical capital and liquidity ratios and dynamic provisioning frameworks. These tools influence the aggregate level of leverage and maturity mismatch in the financial system. As such, they might be used to contain generalised risks arising across the financial sector. For example, the countercyclical capital buffer (CCB) under Basel III is intended to temper aggregate leverage over the credit cycle. Sectoral capital or liquidity requirements could, by contrast, have a role to play in targeting emerging risks in particular asset or liability classes. Some balance sheet tools may have a more structural dimension. For example, additional capital and/or liquidity requirements for systemically important institutions might be used to tackle cross-sectional risks, by lowering their probability of failure. Institutional reform, such as the structural separation or ring-fencing of investment and retail banking activities as proposed in the UK [by ICB (2011)], in the EU [by Liikanen (2012)] and in the US [by Volcker (2011)] operate instead by lowering the losses felt across the system in the event of failure, in part by enhancing the resolvability of large, complex banks. Tools that influence the terms and conditions in financial transactions include the ability to restrict the quantity of, or the capital requirements on, lending at high LTVs. These macroprudential tools have been deployed by a number of emerging market countries over the past few years, including China, Hong Kong and Korea. Macroprudential policy could also operate on minimum margining requirements on secured financing or derivative 20 See also CGFS (2010) and Bank of England (2011) for closely related analyses. BANCO DE ESPAÑA 17 ESTABILIDAD FINANCIERA, NÚM. 2418 transactions within the financial system the wholesale market equivalent of minimum LTV ratios [CGFS (2009)]. The third category of macroprudential tools market structure includes a variety of interventions aimed at altering the topology of the financial network. For example, targeted disclosure requirements can be used to reduce uncertainty about specific exposures or interconnections, which may amplify cyclical or structural risks. The structure of remuneration practices could be used to influence risk-taking incentives by managers of financial firms. And the design and use of organised trading platforms and/or obligations to clear trades through central counterparties could bolster the resilience of markets that are central to the smooth functioning of the financial system. 4 Case study: operationalising countercyclical capital buffers in the UK How might macroprudential policy be operated in practice? In this section, we consider the tasks involved in operationalising one particular macroprudential tool: the countercyclical buffer (CCB). 21 The CCB introduces a time-varying capital buffer over and above normal microprudential standards in relation to banks domestic exposures. It can be raised during periods of exuberance and subsequently reduced. 22 The implementation of this tool requires: a) a risk assessment process; b) a procedure for reaching decisions, explaining those decisions to the public, coordinating with other relevant bodies including systemic risk authorities in other countries and enforcing decisions with firms; and c) an assessment of the possible impact of those decisions on financial stability and growth. In what follows, we describe progress in the UK towards developing a framework for carrying out each of these steps. The material in this section draws heavily on the analysis presented in Bank of England (2013). 4.1 RISK ASSESSMENT AND INDICATORS TO GUIDE DECISION-MAKING There are many different approaches for identifying threats to the financial system. Many authorities use indicator dashboards or cobwebs, including the European Systemic Risk Board, the Office of Financial Research in the United States, the World Bank, the Reserve Bank of New Zealand and the Norges Bank. 23 Stress testing aims to explore the resilience of the financial system under various adverse scenarios. 24 Other modelling approaches include early-warning leading indicator models, composite indicators of systemic risk, and Merton-based models of systemic risk that use contingent claims analysis. 25 Given the complexity and state-contingency of signals from indicators and models, it would not make sense to tie movements in the CCB mechanically to any specific set of indicators or models. At the same time, the Bank of England s new Financial Policy Committee (FPC) has identified a relatively short list of core financial and economic indicators that it will routinely review to help guide decisions to adjust the CCB. These are intended to help anchor policy actions, provide some consistency to decisionmaking and give a basis for explaining actions to an external audience. They help enhance the predictability of the regime and reinforce the signalling channel of macroprudential policy. 21 See Juks and Melander (2012) for a similar analysis for the case of Sweden. 22 The design features of the CCB are prescribed in some detail in Basel III and, in Europe, the forthcoming CRDIV/ CRR. For further details on the specification of this tool in the United Kingdom, see Bank of England (2013). 23 For the US, see section 3 of the OFR Annual Report (2012). The ESRB s Risk Dashboard is published on the web (see On the cobweb approach used in New Zealand and Norway, see Bedford and Bloor (2009) and Dahl et al. (2011), respectively. 24 See Aikman et al. (2009), Burrows et al. (2012) and Kapadia et al. (2013) for a discussion of the Bank of England s approach to stress testing and its RAMSI model. 25 On early warning indicator models, see Kaminsky and Reinhart (1999), Drehmann et al. (2011), Borio and Lowe (2002, 2004) and Barrell et al. (2010). On composite indicator models, see Illing and Liu (2006) and Holló et al. (2012). On contingent claims models, see Gray et al. (2008) and Gray and Jobst (2011). BANCO DE ESPAÑA 18 ESTABILIDAD FINANCIERA, NÚM. 2419 UK CREDIT GAP AND CREDIT GROWTH (a) (b) (c) CHART 3 40 Percent of GDP CREDIT-TO-GDP GAP (PERCENTAGE POINTS) CREDIT GROWTH (PERCENT ON A YEAR EARLIER) SOURCES: ONS, Bank of England and Bank calculations. a b c The full set of indicators is discussed in detail in Bank of England (2013); a brief overview is given below. Particular emphasis is placed on simple, high-level indicators rather than more complex metrics. As well as being important for transparency and accountability reasons, some empirical evidence and case studies suggest that simple indicators can often out-perform more complex alternatives in their predictive power due to their greater robustness in the face of uncertainty. 26 A natural starting point is the so-called credit-to-gdp gap, defined as the deviation of the ratio of household and corporate indebtedness to GDP from its long term trend. This is given particular prominence in Basel III. It has been found to be a useful leading indicator of past crises in many countries within sample. 27 In the United Kingdom, it performed well in signalling emerging vulnerabilities in advance of each of the last three major episodes of financial distress (Chart 3). Prior to the current crisis, it would have suggested activating the CCB as early as It also would have suggested activating the CCB ahead of the UK secondary banking crisis in the 1970s and the small banks crisis in the early 1990s. 28 As discussed by Bank of England (2013, Box 2) and Giese et al. (2013), however, it is important to augment the information in the credit-to-gdp gap with a range of complementary indicators. This partly reflects its poorer ability to signal the possible need to reduce the CCB in the face of deteriorating credit conditions (Chart 3). The indicator also fails to account for the absolute level of credit and is agnostic on the sources or quality of credit. To meet these concerns, it is helpful to monitor a wider set of indicators reflecting bank and non-bank balance sheet stretch. Aggregate risk-based capital ratios and leverage ratios reflect the amount of capital that the financial sector has available to absorb losses on its 26 See Haldane and Madouros (2012) and Aikman et al. (2013). 27 See Borio and Lowe (2002), Alessi and Detken (2009) and Drehmann, Borio and Tsatsaronis (2011). Barrell and Karim (2012), however, find little evidence that the indicator signals crises in OECD countries, although they find some role in emerging market economies. Repullo and Saurina (2012) also criticise this indicator on the grounds of its negative correlation with GDP growth in many countries. 28 See Giese et al. (2013). BANCO DE ESPAÑA 19 ESTABILIDAD FINANCIERA, NÚM. 2420 UK BANKS LEVERAGE RATIOS (a) CHART 4 14 Percent INTERQUARTILE RANGE RANGE MEAN (b) BASEL III DEFINITION (c) SOURCES: Published accounts, FSA supervisory data and Bank calculations. a The mean and ranges shown are based on the simple leverage ratio de ned as the ratio of shareholders claims to total assets based on banks published accounts (note a discontinuity due to introduction of IFRS accounting standards in 2005, which tends to reduce leverage ratios thereafter). Data exclude Northern Rock from b Weighted by total assets. c The 'Basel III leverage ratio', from end-2011 onwards, is calculated as aggregate peer group Tier 1 capital over aggregate leverage ratio exposure, according to the proposed Basel III de nition. However, Tier 1 capital includes some grandfathered instruments which will no longer be eligible after the full transition in The Basel III sample includes Barclays, HSBC, Lloyds Banking Group, RBS, Nationwide, Santander UK and Co-operative bank. Last data point is October assets, on a risk-weighted and unweighted basis respectively. A rapid build-up in leverage (i.e. a fall in leverage ratios) in the major UK banks was an important driver of the current financial crisis (Chart 4). Risk-based capital ratios tended to provide poorer signals before this crisis, particularly for larger banks 29 ; their failure to signal impending problems reflected a secular decline in average risk weights. Some studies from earlier episodes, however, have tended to find a more positive role for risk-based standards in predicting bank failure. 30 Going forward, there is likely to be value in monitoring both metrics in determining whether banks have sufficient buffers to absorb future losses during periods of stress. And since profits are the first line of defence against losses, simple measures of the core profitability of the banking system, such as the pre-tax return on assets, are also likely to be useful in such circumstances. Another helpful indicator of banks balance sheet stretch is the loan-to-deposit ratio, which provides a signal of whether the provision of credit has become too reliant on unstable funding sources. Rising loan-to-deposit ratios were evident in many countries prior to this crisis. This indicator also performed well in signalling impending distress in East Asia in (Chart 5). Market-based metrics can provide corroborative evidence on perceptions of banking sector health. Spreads on bank debt, such as subordinated debt spreads and CDS on senior unsecured debt, indicate financial market participants assessment of the likelihood of bank failure. The views of equity market investors, meanwhile, can be gauged by considering banks price to book ratios and market-based leverage ratios. But these indicators need to be interpreted with caution. In periods of exuberance, they may be subject to significant mispricing or indeed even a volatility paradox : times of low volatility may be associated with a build up of leverage, which increases systemic risk. 29 Haldane and Madouros (2012). 30 See Avery and Berger (1991 and Estrella, Park and Peristiani (2000). BANCO DE ESPAÑA 20 ESTABILIDAD FINANCIERA, NÚM. 24 Mostrar más
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