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Portfolio selection: An extreme value approach

Journal of Banking & Finance 2013 37(2), 305-323
We show theoretically that lower tail dependence (χ), a measure of the probability that a portfolio will suffer large losses given that the market does, contains important information for risk-averse investors. We then estimate χ for a sample of DJIA stocks and show that it differs systematically from other risk measures including variance, semi-variance, skewness, kurtosis, beta, and coskewness. In out-of-sample tests, portfolios constructed to have low values of χ outperform the market index, the mean return of the stocks in our sample, and portfolios with high values of χ. Our results indicate that χ is conceptually important for risk-averse investors, differs substantially from other risk measures, and provides useful information for portfolio selection.

Bank funding costs in a rising interest rate environment

Journal of Banking & Finance 2018 87, 164-186
One key risk to the banking system is how funding costs will change as monetary policy is normalized and interest rates rise after almost a decade of near-zero rates. Our contribution is to develop a model that jointly estimates banks’ balance sheets and retail interest rates to arrive at a consistent estimate of the change in bank funding costs as market rates change. Our estimates imply a 100 basis-point shock to the Federal Funds rate would increase overall deposit funding costs by about $40 billion, which is roughly equal to 25% of aggregate annual net income for commercial banks and savings institutions. We also find that deposit rate responses are largely symmetric, in contrast to some previous research showing deposit rates are less responsive to upward movements in reference rates. We introduce unique and confidential data on bank deposit betas to anchor our results.