Bank of England Working Papers -
Abstracts 2008 (no. 337 - 359)

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The following are brief abstracts of working papers. Those papers that are out of print are marked as such (oop). For details of how to obtain copies of working papers, both in and out of print, see the Working Papers main page.

You can also view the full text of working papers 23 and 24 (from 1994) and working papers since 1997 as PDF files, readable with the latest version of Adobe Acrobat (this is available free from Adobe's Website ). The working papers are listed with the most recent papers first.

Working Paper No 359
Globalisation, import prices and inflation dynamics
Chris Peacock and Ursel Baumann
(369k)

In this paper we model the role of open-economy effects within a New Keynesian Phillips Curve (NKPC) via the inclusion of intermediate imports in firms' production technology. Using this framework we provide evidence on two questions: first, does the inclusion of import prices help explain post-war inflation dynamics in the United Kingdom , United States and Japan; and second, has the influence of import prices in firms' costs become greater over the more recent period since the mid-1980s. Overall, our results suggest that import prices do help explain movements in inflation; in particular, NKPC models that allow for import prices to enter into firms' costs outperform closed-economy models in sample. However, our results suggest that the influence of import prices has generally remained constant across our sample period, with perhaps only the United Kingdom providing some evidence that import prices have become more important in firms' marginal costs.

Working Paper No 358
Understanding the real rate conundrum: an application of no-arbitrage finance models to the UK real yield curve
Michael Joyce, Iryna Kaminska and Peter Lildholdt
(505k)

Long-horizon interest rates in the major international bond markets fell sharply during 2004 and 2005, at the same time as US policy rates were rising; a phenomenon famously described as a ‘conundrum' by Alan Greenspan the Federal Reserve Chairman. But it was arguably the decline in international long real rates over this period which was more unusual and, by the end of 2007, long real rates in the United Kingdom remained at recent historical lows. In this paper, we try to shed light on the recent behaviour of long real rates, by estimating several empirical models of the term structure of real interest rates, derived from UK index-linked bonds. We adopt a standard ‘finance' approach to modelling the real term structure, using an essentially affine framework. While being empirically tractable, these models impose the important theoretical restriction of no arbitrage, which enables us to decompose forward real rates into expectations of future short (ie risk-free) real rates and forward real term premia. One general finding that emerges across all the models estimated is that time-varying term premia appear to be extremely important in explaining movements in long real forward rates. Although there is some evidence that long-horizon expected short real rates declined over the conundrum period, our results suggest lower term premia played the dominant role in accounting for the fall in long real rates. This evidence could be consistent with the so-called ‘search for yield' and excess liquidity explanations for the conundrum, but it might also partly reflect strong demand for index-linked bonds by institutional investors and foreign central banks.

Working Paper No 357
A no-arbitrage structural vector autoregressive model of the UK yield curve
Iryna Kaminska
(630k)

This paper combines a structural vector autoregression (SVAR) with a no-arbitrage approach to build a multifactor affine term structure model (ATSM). The resulting no-arbitrage structural vector autoregressive (NA-SVAR) model implies that expected excess returns are driven by the structural macroeconomic shocks. This is in contrast to a standard ATSM, in which agents are concerned with non-structural risks. As a simple application of a NA-SVAR model, we study the effects of supply, demand and monetary policy shocks on the UK yield curve. We show that all shocks affect the slope of the yield curve, with demand and supply shocks accounting for a large part of the time variation in bond yields. The short end of the yield curve is driven mainly by the expectations component, while the term premium matters for the dynamics of the long end of the yield curve.

Working Paper No 356
Measuring monetary policy expectations from financial market instruments
Michael Joyce, Jonathan Relleen and Steffen Sorensen
(1mb)

This paper reviews the main instruments and associated yield curves that can be used to measure financial market participants’ expectations of future UK monetary policy rates. We attempt to evaluate these instruments and curves in terms of their ability to forecast policy rates over the period from October 1992, when the United Kingdom first adopted an explicit inflation target, to March 2007. We also investigate several model-based methods of estimating forward term premia, in order to calculate risk-adjusted forward interest rates. On the basis of both in and out-of-sample test results, we conclude that, given the uncertainties involved, it is unwise to rely on any one technique to measure policy rate expectations and that the best approach is to take an inclusive approach, using a variety of methods and information.

Working Paper No 355
The network topology of CHAPS Sterling
Christopher Becher, Stephen Millard and Kimmo Soramäki
(667k)

In this paper, we seek to understand the network topology of large-value interbank payment flows in the United Kingdom so as to understand better the risks associated with the system. We first examined the broad network topology of interbank payments in the United Kingdom. We found that, despite the fact that there are far fewer banks in the United Kingdom than in the United States, the structure of UK interbank payments is similar in certain respects to that of the United States, but that the tiered structure of the UK system implies rather different risk characteristics. We then looked at CHAPS and found that payment flows in CHAPS form a well-connected network whose properties change little day to day. This means that liquidity is able to flow efficiently around the network and that the network is quite resilient to shocks. This finding was backed up by examining the effects of a particular incident on the properties of the CHAPS network. In that particular instance, the effective removal of one bank for much of the day had little impact on the ability of other banks to make payments between one another.

Working Paper No 354
Estimating the determinants of capital flows to emerging market economies: a maximum likelihood disequilibrium approach
Guillermo Felices and Bjorn-Erik Orskaug
(820k)

This paper studies the determinants of capital flows defined as gross external bond and syndicated loan issuance to a group of emerging market economies (EMEs) since 1992. We follow the previous literature by estimating an explicit disequilibrium demand and supply model of capital flows using maximum likelihood techniques. We use the estimated supply and demand determinants to calculate time-varying probabilities of international supply-side rationing, estimating the model for the asset class as a whole. We then explore applications to individual EMEs including Brazil, Chile, China, Colombia, Korea, Mexico, Poland and Thailand using a longer time period than in previous work. For our selection of EMEs taken together, the main determinants of the supply of capital from the rest of the world are credit ratings, EME spreads, world growth and US high-yield spreads. On the demand side, the EME equity index has a positive effect on capital flows, while EME spreads and commodity prices have a negative one. The applications to individual countries show similar signs. Finally, we calculate the probability of capital crunch for EMEs in aggregate and for some countries individually.

Working Paper No 353
The conduct of global monetary policy and domestic stability
Andrew P Blake and Bojan Markovic
(1.1mb)

The purpose of this paper is to examine how important an improvement in global monetary policy might be for the macroeconomic performance of a small open economy such as the United Kingdom. Our paper contributes to the literature by proposing a new methodology to treat indeterminate solutions (the most-robust solution), and by analysing a policy improvement within a three-country framework. Both contributions yield a rich set of theoretical and policy implications. We find that the performance of the domestic macroeconomy depends crucially on domestic monetary policy, but there remains significant potential for monetary policy abroad to improve the stability of inflation and output in a small open economy. Importantly, how much of this potential spillover from policy abroad crystallises is still endogenous to the conduct of domestic policy. We also show that an improvement in policy abroad may not reduce domestic volatility when domestic policy is the only poor policy globally. In such a case domestic volatility can even become worse. Our paper also yields interesting results related to the impact of a policy improvement abroad on inflation persistence in the domestic economy and her exposure to foreign shocks.

Working Paper No 352
An agent-based model of payment systems
Marco Galbiati and Kimmo Soramäki
(986k)

This paper lays out and simulates a multi-agent, multi-period model of an RTGS payment system. At the beginning of the day, banks choose how much costly liquidity to allocate to the settlement process. Then, they use it to execute an exogenous, random stream of payment orders. If a bank's liquidity stock is depleted, payments are queued until new liquidity arrives from other banks, imposing costs on the delaying bank. The paper studies the equilibrium level of liquidity posted in the system, performing some comparative statics and obtaining: i) a liquidity demand curve which links liquidity to delay costs and ii) insights on the efficiency of alternative system configurations.

Working Paper No 351
The cyclicality of mark-ups and profit margins for the United Kingdom: some new evidence
Clare Macallan, Stephen Millard and Miles Parker
(850k)

In this paper, we assess the cyclicality of mark-ups and profit margins within the United Kingdom, at both the aggregate and industry level. We find that the private sector labour share moves countercyclically, suggesting that the aggregate mark-up moves procyclically. This result survives when we consider more sophisticated measures of the mark-up. And this result is also supported by industry-level data. We find that the aggregate market sector profit share moves procyclically and that the cyclical behaviour of profit margins is largely homogenous across industries. Nevertheless, there is some evidence that margins moved against the cycle in the late 1990s, starting to fall in 1997, whereas GDP growth did not peak until 2000. In tandem with these cyclical movements, we also find that the market sector profit share has trended upwards since 1970, in contrast to the aggregate mark-up, which fell over the same period.

Working Paper No 350
Investigating the structural stability of the Phillips curve relationship
Jan J J Groen and Haroon Mumtaz
(543k)

The reduced-form correlation between inflation and measures of real activity has changed substantially for the main developed economies over the post-WWII period. In this paper we attempt to describe the observed inflation dynamics in the United Kingdom, the United States and the euro area with a sequence of New Keynesian Phillips Curve (NKPC) equations that are log-linearised around different, non-zero, steady-state inflation levels. In doing this, we follow a two-step estimation strategy. First, we model the time variation in the relationship between inflation and a real cost-based measure of activity through a Markov-switching vector autoregressive model. We then impose the cross-equation restrictions of a Calvo pricing-based NKPC under non-zero steady-state inflation and estimate the structural parameters by minimising for each inflation state the distance between the restricted and unrestricted vector autoregressive parameters. The structural estimation results indicate that for all the economies there is evidence for a structurally invariant NKPC, albeit with a significant backward-looking component.

Working Paper No 349
Dealing with country diversity: challenges for the IMF credit union model
Gregor Irwin, Adrian Penalver, Chris Salmon and Ashley Taylor
(985k)

We develop a model in which countries can protect themselves against shocks by subscribing to a credit union that shares the key features of the International Monetary Fund, or by self-insuring through accumulating reserves. We assess the impact of the increasing heterogeneity of the Fund's membership on the political equilibrium Fund size and hence its effectiveness as a credit union. We find the Fund's existing lending framework is well suited to a world in which its members have homogeneous interests, but as the membership has become more heterogeneous the Fund is increasingly unlikely to provide financing on a sufficient scale to meet the demands of higher-risk members, leading them to rely more heavily on self-insurance. We conclude that the framework governing the Fund's lending operations may no longer be appropriate.

Working Paper No 348
The elasticity of substitution: evidence from a UK firm-level data set
Sebastian Barnes, Simon Price and María Sebastiá Barriel
(838k)

Using a panel of UK firms spanning three decades, we provide estimates of the long-run elasticity of substitution between capital and other factors of production, the (negative of the) elasticity of capital and investment with respect to the user cost. The parameter is estimated using 'time averages' (with data differenced over long periods) and pooled mean group panel methods. The robust result is that the elasticity is in the region of 0.4. This is consistent with previous results obtained using aggregate UK data, and is also in line with some recent results using US firm-level data. Estimated returns to scale exceed unity. When constant returns are imposed, the estimated elasticity of substitution is not substantially changed.

Working Paper No 347
Non-linear adjustment of import prices in the European Union
José Manuel Campa, José M González Mínguez and María Sebastiá Barriel
(1.3mb)

This paper focuses on the non-linear adjustment of import prices in national currency to shocks in exchange rates and foreign prices measured in the exporters' currency of products originating outside the euro area and imported into European Union countries (EU-15). The paper looks at three different types of non-linearities: (a) non-proportional adjustment (the size of the adjustment grows more than proportionally with the size of the misalignments), (b) asymmetric adjustment to cost-increasing and cost-decreasing shocks, and (c) the existence of thresholds in the size of misalignments below which no adjustment takes place. There is evidence of more than proportional adjustment towards long-run equilibrium in manufacturing industries. In these industries, the adjustment is faster the further away current import prices are from their implied long-run equilibrium. In contrast, a proportional linear adjustment cannot be rejected for some other imports (especially within agricultural and commodity imports). There is also strong evidence of asymmetry in the adjustment to long-run equilibrium. Deviations from long-run equilibrium due to exchange rate appreciations of the home currency result in a faster adjustment than those caused by a home currency depreciation. Finally, we also find that adjustment takes place in the industries in our sample only when deviations are above certain thresholds, and that these thresholds tend to be somewhat smaller for manufacturing industries than for commodities.

Working Paper No 346
Network models and financial stability
Erlend Nier, Jing Yang, Tanju Yorulmazer and Amadeo Alentorn
(1.1mb)

Systemic risk is a key concern for central banks charged with safeguarding overall financial stability. In this paper we investigate how systemic risk is affected by the structure of the financial system. We construct banking systems that are composed of a number of banks that are connected by interbank linkages. We then vary the key parameters that define the structure of the financial system - including its level of capitalisation, the degree to which banks are connected, the size of interbank exposures and the degree of concentration of the system - and analyse the influence of these parameters on the likelihood of contagious (knock-on) defaults. First, we find that the better capitalised banks are, the more resilient is the banking system against contagious defaults and this effect is non-linear. Second, the effect of the degree of connectivity is non-monotonic, that is, initially a small increase in connectivity increases the contagion effect; but after a certain threshold value, connectivity improves the ability of a banking system to absorb shocks. Third, the size of interbank liabilities tends to increase the risk of knock-on default, even if banks hold capital against such exposures. Fourth, more concentrated banking systems are shown to be prone to larger systemic risk, all else equal. In an extension to the main analysis we study how liquidity effects interact with banking structure to produce a greater chance of systemic breakdown. We finally consider how the risk of contagion might depend on the degree of asymmetry (tiering) inherent in the structure of the banking system. A number of our results have important implications for public policy, which this paper also draws out.

Working Paper No 345
Summary statistics of option-implied probability density functions and their properties
Damien Lynch and Nikolaos Panigirtzoglou
(839k)

The statistics that summarise probability density functions (pdfs) implied from option prices can be used to assess market expectations about future uncertainty, asymmetry and the probability of extreme movements in asset prices. A time-series analysis of these statistics for equity index and interest rate markets provides some stylised facts about the behaviour of these elements of market expectations, their historical distribution, similarity and relative stability. Relationships between them and movements in underlying asset prices are considered. Cross-asset and cross-country comparisons and the information content of the implied pdfs for future macroeconomic and financial variables are also assessed.

Working Paper No 344
International monetary co-operation in a world of imperfect information
Kang Yong Tan and Misa Tanaka
(397k)

This paper examines the welfare implications of international monetary co-operation using a stylised two-country New Keynesian general equilibrium model of imperfect information. We show that setting a self-oriented monetary policy rule generally leads to welfare gains relative to passive monetary policy even when central banks do not have perfect information about the foreign economy. However, information sharing between central banks in this set-up, by itself, has ambiguous welfare implications. Gains from monetary co-ordination are largest when productivity shocks are negatively correlated across countries.

Working Paper No 343
Efficient frameworks for sovereign borrowing
Gregor Irwin and Gregory Thwaites
(1.5mb)

This paper presents a theoretical model of strategic default to assess how national and international policymakers should seek to influence the cost of default and the distribution of bargaining power in the event of a default. We find that, in the absence of restrictions on the parameter space, deadweight costs of default should be driven to zero. Moreover, if the debtor is risk-averse, there is an optimal division of bargaining power between the debtor and its creditors. Even with restrictions on the parameter space, marginally lower deadweight costs, possibly in some combination with greater creditor bargaining power, can always raise social welfare ex ante. However, once debt has been contracted, the debtor's trade-off between creditor bargaining power and deadweight costs changes fundamentally. In equilibrium, the deadweight costs of default may therefore tend to be too high, and the allocation of bargaining power inefficiently skewed towards the debtor. The challenge for policymakers is to find credible, time-consistent combinations of policies that can both reduce deadweight costs and shift bargaining power towards creditors.

Working Paper No 342
That elusive elasticity and the ubiquitous bias: is panel data a panacea?
James Smith
(395k)

There is often assumed to be a unit elasticity of substitution between capital and labour. But estimates based on neoclassical capital demand equations frequently find a smaller value. Recent time-series work for the United States and Canada has suggested that, once the biases inherent in estimating cointegrating vectors are properly accounted for, the elasticity could indeed be close to 1. This paper investigates this possibility for the United Kingdom. First the analysis considers aggregate data where the estimated elasticity is close to 0.4. Then a unique industry-level data set for the United Kingdom is exploited in order to further pinpoint the estimated elasticity. Estimates using dynamic panel data methods are close to those from aggregate data, providing a robust statistical rejection of a unit elasticity in UK data.

Working Paper No 341
Evolving international inflation dynamics: evidence from a time-varying dynamic factor model
Haroon Mumtaz and Paolo Surico
(657k)

Several industrialised countries have had a similar inflation experience in the past 30 years, with inflation high and volatile in the 1970s and the 1980s but low and stable in the most recent period. We explore the dynamics of inflation in these countries via a time-varying factor model. This statistical model is used to describe movements in inflation that are idiosyncratic or country specific and those that are common across countries. In addition, we investigate how comovement has varied across the sample period. Our results indicate that there has been a decline in the level, persistence and volatility of inflation across our sample of industrialised countries. In addition, there has been a change in the degree of comovement, with the level and persistence of national inflation rates moving more closely together since the mid-1980s.

Working Paper No 340
Financial innovation, macroeconomic stability and systemic crises
Prasanna Gai, Sujit Kapadia, Stephen Millard and Ander Perez
(1mb)

We present a general equilibrium model of intermediation designed to capture some of the key features of the modern financial system. The model incorporates financial constraints and state-contingent contracts, and captures the spillovers associated with asset fire sales during periods of stress. If a sufficiently severe shock occurs during a credit expansion, these spillovers can potentially generate a systemic financial crisis that may be self-fulfilling. Our model suggests that financial innovation and greater macroeconomic stability may have made financial crises in developed countries less likely than in the past, but potentially more severe.

Working Paper No 339
The integrated impact of credit and interest rate risk on banks: an economic value and capital adequacy perspective
Mathias Drehmann, Steffen Sorensen and Marco Stringa
(898k)

Credit and interest rate risk in the banking book are the two most important risks faced by commercial banks. In this paper we derive a consistent and general framework to measure the integrated impact of both risks on banks' portfolios. The framework accounts for all sources of credit risk and interest rate risk. By modelling the whole portfolio of a bank and by taking account of the repricing characteristics of all exposures, we can assess the impact of credit and interest rate risk not only on the bank's economic value but also on its future earnings and capital adequacy. We apply our framework to a hypothetical bank in normal and stressed conditions. The simulation highlights that it is fundamental to measure the impact of interest rate and credit risk jointly. We also show that it is crucial to model the whole portfolio, including the repricing and maturity characteristics of assets, liabilities and off balance sheet items.

Working Paper No 338
Monetary policy shifts and inflation dynamics
Paolo Surico
(470k)

The New Keynesian Phillips Curve plays a central role in modern macroeconomic theory. A vast empirical literature has estimated this structural relationship over various post-war full samples. While it is well known that in a standard sticky price model a 'weak' central bank response to inflation generates sunspot fluctuations, the consequences of pooling observations from different monetary policy regimes for (i) the estimates of the structural Phillips curve and (ii) the estimates of inflation persistence had not been investigated. Using Monte Carlo simulations from a purely forward-looking model, this paper shows that indeterminacy can introduce a sizable persistence in the process of inflation. On the reduced form, our results show that inflation persistence can be endogenous to the policy regime rather than intrinsic to the structure of the economy. On the structural form, we find that by neglecting equilibrium indeterminacy the estimates of the forward-looking term of the New Keynesian Phillips Curve are biased downward. The implications are in line with the empirical evidence for the United Kingdom and United States.

Working Paper No 337
Risks and efficiency gains of a tiered structure in large-value payments: a simulation approach
Ana Lasaosa and Merxe Tudela
(134k)

The large-value payment system in the United Kingdom (CHAPS) is highly tiered: a few settlement banks make payments on behalf of many customer banks. This paper makes use of a simulation approach to quantify by how much tiering affects, on the one hand, concentration and credit risk and, on the other, the liquidity needs of CHAPS. We do so by creating scenarios where current settlement banks become customer banks and thus we increase the degree of tiering. The results show that concentration risk would rise substantially in what is already a highly concentrated system. As for credit risk, the size of intraday exposures compared with settlement banks' capital is very small and therefore the likelihood of contagion remote. More importantly, the increase in credit risk brought to the system by settlement banks leaving CHAPS bears little relationship to the values settled by each individual bank. We find that increasing the degree of tiering in CHAPS leads to substantial liquidity savings - although the liquidity saved is only a fraction of the spare liquidity currently posted in the system. Most of the savings are due to liquidity pooling rather than to internalisation of payments. There is a strong relationship between changes in values settled and liquidity needs. This relationship can be used to forecast the impact on liquidity needs if more banks were to join CHAPS. The quantification of the trade-off between risk and efficiency in different scenarios provides policymakers with a useful analytical framework for analysing the effects of tiering.