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The profitability of small single-market banks in an era of multi-market banking

Journal of Banking & Finance 2009 33(2), 263-271 open access
This paper examines the relationship between the profitability of small single-market banks and the presence in the market of large banking organizations and banking organizations that operate primarily outside of the local banking market. We find that, in rural banking markets, the profitability of small single-market banks is significantly related to the presence of both large and small primarily-out-of-market banks. We also find that an increased presence of large or small primarily-out-of-market banks in rural banking markets reduces the positive effect of an increase in concentration on small single-market bank profits. This finding is consistent with theoretical predictions reported in the recent literature and has important implications for antitrust policy. In urban banking markets, we find little evidence of any relationship between the profitability of small single-market banks and the presence of large or primarily-out-of-market banks.

Bond risk premia and realized jump risk

Journal of Banking & Finance 2009 33(12), 2333-2345
We find that augmenting a regression of excess bond returns on the term structure of forward rates with an estimate of the mean realized jump size almost doubles the R2 of the forecasting regression. The return predictability from augmenting with the jump mean easily dominates that offered by augmenting with options-implied volatility and realized volatility from high-frequency data. In out-of-sample forecasting exercises, inclusion of the jump mean can reduce the root mean square prediction error by up to 40%. The incremental return predictability captured by the realized jump mean largely accounts for the countercyclical movements in bond risk premia. This result is consistent with the setting of an incomplete market in which the conditional distribution of excess bond returns is affected by a jump risk factor that does not lie in the span of the term structure of yields.

A practical approach to validating a PD model

Journal of Banking & Finance 2009 33(4), 701-708
The capital adequacy framework Basel II aims to promote the adoption of stronger risk management practices by the banking industry. The implementation makes validation of credit risk models more important. Lenders therefore need a validation methodology to convince their supervisors that their credit scoring models are performing well. In this paper we take up the challenge to propose and implement a simple validation methodology that can be used by banks to validate their credit risk modelling exercise. We will contextualise the proposed methodology by applying it to a default model of mortgage loans of a commercial bank in the Netherlands.

Asset allocation and location over the life cycle with investment-linked survival-contingent payouts

Journal of Banking & Finance 2009 33(9), 1688-1699
This paper shows how survival-contingent investment-linked payouts can enhance investor wellbeing in the context of a portfolio choice model which integrates uninsurable labor income and asymmetric mortality expectations. In exchange for illiquidity, these products provide the consumer with access to mutual-fund style portfolio choice, as well as the survival credit generated from pooling mortality risk. Our model generates optimal asset location patterns indicating how much to hold in liquid versus illiquid survival-contingent payouts over the lifetime, and also asset allocation paths, showing how to invest in stocks versus bonds. We show that the investor who moves her money out of liquid saving into survival-contingent assets gradually from middle age to retirement and beyond, will enhance her welfare by as much as 50%. The results are robust to the introduction of uninsurable consumption shocks in housing expenses, income flows during the worklife and retirement, sudden changes in health status, and medical expenses.

Time diversification: Definitions and some closed-form solutions

Journal of Banking & Finance 2009 33(6), 1101-1111
We establish general conditions under which younger investors should invest a larger proportion of their wealth in risky assets than older ones. In the finite horizon dynamic setting, we show that such phenomenon, known as ‘‘time diversification,” can occur in the presence of human wealth, guaranteed consumption, or mean-reverting stock returns. We formalize two alternative notions of time diversification commonly confounded in the literature. Analytic solutions are provided for both time-series and cross-sectional forms of time diversification. To our best knowledge, this paper is the first to solve in closed-form the hedging demand for a CARA investor with inter-temporal consumption and a finite horizon, facing mean-reverting expected returns. Our results indicate that horizon can have a significant effect on the portfolio demand of a CARA investor due to inter-temporal hedging.