Dimitrios P. Tsomocos

Bio: Dimitrios P. Tsomocos is an academic researcher from University of Oxford. The author has contributed to research in topics: Monetary policy & Market liquidity. The author has an hindex of 28, co-authored 125 publications receiving 2920 citations. Previous affiliations of Dimitrios P. Tsomocos include Yale University & Cowles Foundation.

Procyclicality and the new Basel Accord - banks’ choice of loan rating system

Abstract: The Basel Committee on Banking Supervision is proposing to introduce, in 2006, new risk-based requirements for internationally active (and other significant) banks. These will replace the relatively risk-invariant requirements in the current Accord. The new requirements for the largest bank will be based on bank ratings of the probability of default of the borrowers. There is evidence that the choice of loan ratings which are conditional on the point in the economic cycle could lead to sharp increases in capital requirements in recessions. This makes the question of which rating schemes banks will use very important. The paper uses a general equilibrium model of the financial system to explore whether banks would choose to use a countercyclical, procyclical or neutral rating scheme. The results indicate that banks would not choose a stable rating approach, which has important policy implications for the design of the Accord. It makes it important that banks are given incentives to adopt more stable rating schemes. This consideration has been reflected in the Committee's latest proposals, in October 2002.

A Model to Analyse Financial Fragility

Abstract: This paper sets out a tractable model which illuminates problems relating to individual bank behaviour, to possible contagious inter-relationships between banks, and to the appropriate design of prudential requirements and incentives to limit `excessive' risk-taking. Our model is rich enough to include heterogeneous agents, endogenous default, and multiple commodity, and credit and deposit markets. Yet, it is simple enough to be effectively computable and can therefore be used as a practical framework to analyse financial fragility. Financial fragility in our model emerges naturally as an equilibrium phenomenon. Among other results, a non-trivial quantity theory of money is derived, liquidity and default premia co-determine interest rates, and both regulatory and monetary policies have non-neutral effects. The model also indicates how monetary policy may affect financial fragility, thus highlighting the trade-off between financial stability and economic efficiency.

A model to analyse financial fragility

Abstract: Our purpose in this paper is to produce a tractable model which illuminates problems relating to individual bank behaviour and risk-taking, to possible contagious interrelationships between banks, and to the appropriate design of prudential requirements and incentives to limit ‘excessive’ risk-taking. Our model is rich enough to include heterogenous agents (commercial banks and investors), endogenous default, and multiple commodity, and credit and deposit markets. Yet, it is simple enough to be effectively computable. Financial fragility emerges naturally as an equilibrium phenomenon. In our model a version of the liquidity trap can occur. Moreover, the Modigliani-Miller proposition fails either through frictions in the (nominal) financial system or through incentives, arising from the imposed capital requirements, for differential investment behaviour because of capital requirements. In addition, a non-trivial quantity theory of money is derived, liquidity and default premia co-determine interest rates, and both regulatory and monetary policies have non-neutral effects. The model also indicates how monetary policy may affect fi nancial fragility, thus highlighting the trade-off between financial stability and economic efficiency.

A Model to Analyse Financial Fragility

Abstract: This paper sets out a tractable model which illuminates problems relating to individual bank behaviour, to possible contagious inter-relationships between banks, and to the appropriate design of prudential requirements and incentives to limit 'excessive' risk-taking. Our model is rich enough to include heterogeneous agents, endogenous default, and multiple commodity, and credit and deposit markets. Yet, it is simple enough to be effectively computable and can therefore be used as a practical framework to analyse financial fragility. Financial fragility in our model emerges naturally as an equilibrium phenomenon. Among other results, a non-trivial quantity theory of money is derived, liquidity and default premia co-determine interest rates, and both regulatory and monetary policies have non-neutral effects. The model also indicates how monetary policy may affect financial fragility, thus highlighting the trade-off between financial stability and economic efficiency.

Capital Regulation, Risk-Taking and Monetary Policy: A Missing Link in the Transmission Mechanism?

Abstract: Few areas of monetary economics have been studied as extensively as the transmission mechanism. The literature on this topic has evolved substantially over the years, following the waxing and waning of conceptual frameworks and the changing characteristics of the financial system. In this paper, taking as a starting point a brief overview of the extant work on the interaction between capital regulation, the business cycle and the transmission mechanism, we offer some broader reflections on the characteristics of the transmission mechanism in light of the evolution of the financial system. We argue that insufficient attention has so far been paid to the link between monetary policy and the perception and pricing of risk by economic agents - what might be termed the "risk-taking channel" of monetary policy. We develop the concept, compare it with current views of the transmission mechanism, explore its mutually reinforcing link with "liquidity" and analyse its interaction with monetary policy reaction functions. We argue that changes in the financial system and prudential regulation may have increased the importance of the risk-taking channel and that prevailing macroeconomic paradigms and associated models are not well suited to capturing it, thereby also reducing their effectiveness as guides to monetary policy.

The fundamental principles of financial regulation

Abstract: Today's financial regulatory systems assume that regulations which make individual banks safe also make the financial system safe. The eleventh Geneva Report on the World Economy shows that this thinking is flawed. Actions that banks take to make themselves safer can - in times of crisis - undermine the system's stability. The Report argues for a different approach. What is needed is micro-prudential (i.e. bank-level) regulation, macro-prudential (i.e. system-wide) regulation, and careful coordination of the two. Macro-prudential regulation in particular needs reform to ensure it countervails the natural decline in measured risk during booms and its rise in subsequent collapses. "Counter-cyclical capital charges" are the way forward; regulators should adjust capital adequacy requirements over the cycle by two multiples - the first related to above-average growth of credit expansion and leverage, the second related to the mismatch in the maturity of assets and liabilities. Changes to mark-to-market procedures are also needed. Macro- and micro-prudential regulation should be carried out by separate institutions since they differ in focus and expertise required. Central Banks should be tasked with macro-prudential regulation, Financial Services Authorities with micro-prudential regulation. Improved international coordination is also important. Since financial and asset-price cycles differ from country to country, counter-cyclical regulatory policy needs to be implemented mainly by the "host" rather than the "home" country.

Value and Capital

Abstract: LEAVING aside the courageous efforts of people around Monthly Review and Science and Society there has, by and large, been hardly any Marxist tradition among American intellectuals. However, during the last few years the situation has considerably changed and there is now a growing interest in Marxism, particularly among the younger social scientists of America. The book under review falls within this trend.

Lab Experiments are a Major Source of Knowledge in the Social Sciences

Abstract: Laboratory experiments are a widely used methodology for advancing causal knowledge in the physical and life sciences. With the exception of psychology, the adoption of laboratory experiments has been much slower in the social sciences, although during the last two decades, the use of lab experiments has accelerated. Nonetheless, there remains considerable resistance among social scientists who argue that lab experiments lack "realism" and "generalizability". In this article we discuss the advantages and limitations of laboratory social science experiments by comparing them to research based on nonexperimental data and to field experiments. We argue that many recent objections against lab experiments are misguided and that even more lab experiments should be conducted.

A Macroprudential Approach to Financial Regulation

Abstract: Many observers have argued the regulatory framework in place prior to the global financial crisis was deficient because it was largely “microprudential” in nature (Crockett, 2000; Borio, Furfine, and Lowe, 2001; Borio, 2003; Kashyap and Stein, 2004; Kashyap, Rajan, and Stein, 2008; Brunnermeier et al., 2009; Bank of England, 2009; French et al., 2010). A microprudential approach is one in which regulation is partial-equilibrium in its conception, and aimed at preventing the costly failure of individual financial institutions. By contrast, a “macroprudential” approach recognizes the importance of general-equilibrium effects, and seeks to safeguard the financial system as a whole. In the aftermath of the crisis, there seems to be agreement among both academics and policymakers that financial regulation needs to move in a macroprudential direction. According to Federal Reserve Chairman Ben Bernanke (2008): Going forward, a critical question for regulators and supervisors is what their appropriate "field of vision" should be. Under our current system of safety-and-soundness regulation, supervisors often focus on the financial conditions of individual institutions in isolation. An alternative approach, which has been called systemwide or macroprudential oversight, would broaden the mandate of regulators and supervisors to encompass consideration of potential systemic risks and weaknesses as well.