Bank profitability and interest rate risk

It is frequently asserted that the profitability of institutions that lend long and borrow short is restricted during periods of rising interest rates. In banking circles this assertion has been translated into a concern primarily for the soundness of smaller banks, which are commonly thought to hold a large proportion of their portfolios in longer term fixed-rate loans and thus face considerable interest rate risk. Moreover, with the popularity of the new “NOW” accounts and competing money market mutual funds, there is a fear that a potential profit squeeze at these institutions has been made more probable. The present study examines the issue of the interest rate sensitivity of commercial bank profitability at a theoretical level and attempts to measure empirically the extent to which the profitability of different size classes of banks has been affected by periods of changing interest rates since 1976. This study finds that small commercial banks as a group have actually experienced increased profitability both absolutely and relative to large banks in recent periods (since 1976) of rising interest rates. However, this variation is numerically small. This finding calls into question both the usefulness of the maturity composition model as a predictor of interest rate risk and the concern for the supposed plight of small banks during periods of rising interest rates.     

Hedging and value at risk

In this article, it is shown that although minimum‐variance hedging unambiguously reduces the standard deviation of portfolio returns, it can increase both left skewness and kurtosis; consequently the effectiveness of hedging in terms of value at risk (VaR) and conditional value at risk (CVaR) is uncertain. The reduction in daily standard deviation is compared with the reduction in 1‐day 99% VaR and CVaR for 20 cross‐hedged currency portfolios with the use of historical simulation. On average, minimum‐variance hedging reduces both VaR and CVaR by about 80% of the reduction in standard deviation. Also investigated, as an alternative to minimum‐variance hedging, are minimum‐VaR and minimum‐CVaR hedging strategies that minimize the historical‐simulation VaR and CVaR of the hedge portfolio, respectively. The in‐sample results suggest that in terms of VaR and CVaR reduction, minimum‐VaR and minimum‐CVaR hedging can potentially yield small but consistent improvements over minimum‐variance hedging. The out‐of‐sample results are more mixed, although there is a small improvement for minimum‐VaR hedging for the majority of the currencies considered. © 2006 Wiley Periodicals, Inc. Jrl Fut Mark 26:369–390, 2006     

Geographic diversification and risk in banking

Tests of the hypothesis that geographic diversification affects bank risk are conducted on large samples of banking organizations (1976–1985) and focus on intrastate geographic diversification experience. Three composite measures of risk are included iin the tests along with the individual components of these measures. Results show that while composite measures of risk are reduced by geographic diverisification, some inidividual components of these measures increase. Importantly, the results show lower financial risk (the variation in earnings), which is predicted by portfolio theory. However, we also observe lower levels of earnings and capital with greater diversification implying, ceteris paribus, higher risk. This effect is not predicted by portfolio theory, but is predicted by our notion of operating risk. There is apparently more than pure financial risk involved with diversification by firms.     

Hedging long‐term commodity risk

This study focuses on the problem of hedging longer‐term commodity positions, which often arises when the maturity of actively traded futures contracts on this commodity is limited to a few months. In this case, using a rollover strategy results in a high residual risk, which is related to the uncertain futures basis. We use a one‐factor term structure model of futures convenience yields in order to construct a hedging strategy that minimizes both spot‐price risk and rollover risk by using futures of two different maturities. The model is tested using three commodity futures: crude oil, orange juice, and lumber. In the out‐of‐sample test, the residual variance of the 24‐month combined spot‐futures positions is reduced by, respectively, 77%, 47%, and 84% compared to the variance of a naïve hedging portfolio. Even after accounting for the higher trading volume necessary to maintain a two‐contract hedge portfolio, this risk reduction outweighs the extra trading costs for the investor with an average risk aversion. © 2003 Wiley Periodicals, Inc. Jrl Fut Mark 23:109–133, 2003     

Effects of interest rate swaps

In this paper we examine the effect of interest rate swaps on the firm, and identify characteristics of firms that use interest rate swaps, reporting findings consistent with interest rate swaps being used as a risk-reducing instrument. Relative to nonswappers, firms using swaps are more likely to experience decreased cash flow variance in the five-year period subsequent to swap initiation. In addition, firms that engage in swaps are found to be larger and more highly levered than a control sample of nonswappers. Dividing our sample based upon type of swap, we find different characteristics explain different types of swap. In particular we find evidence consistent with swaps from variable to fixed interest rates being engaged in for risk reduction, i.e., hedging purposes.     

The interest rate sensitivity of equity prices with respect to systematic risk and leverage

This study extends the previous empirical research into the sensitibity of equity prices to include interest rates. Specifically, the null hypothesis that the interest rate sensitivity of equity prices is independent of the level of systematic risk and financial leverage is tested. The hypothesis is tested using a short-term and long-term interest rate index. The results show that the interest rate sensitivity of equity prices is independent of the amount of financial leverage but not independent of the level of systematic risk.