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The risk return tradeoff in the long run: 1836–2003

Journal of Financial Economics 2007 85(1), 123-150
Previous studies typically find a statistically insignificant relation between the market risk premium and its expected volatility. Further, several of these studies estimate a negative risk return tradeoff, contrary to the predictions of mainstream theory. Using simulations, I demonstrate that even 100 years of data constitute a small sample that may easily lead to this finding even though the true risk return tradeoff is positive. Small-sample inference is plagued by the fact that conditional volatility has almost no explanatory power for realized returns. Using the nearly two century history of U.S. equity market returns from Schwert [1990. Indexes of United States stock prices from 1802 to 1987. Journal of Business 63, 399–426], I estimate a positive and statistically significant risk return tradeoff. Finally, exploratory analysis suggests a role for a time-varying relation linked to the changing nature of the U.S. economy.

Liquidity and Expected Returns: Lessons from Emerging Markets

Review of Financial Studies 2007 20(6), 1783-1831
[Given the cross-sectional and temporal variation in their liquidity, emerging equity markets provide an ideal setting to examine the impact of liquidity on expected returns. Our main liquidity measure is a transformation of the proportion of zero daily firm returns, averaged over the month. We find that it significantly predicts future returns, whereas alternative measures such as turnover do not. Consistent with liquidity being a priced factor, unexpected liquidity shocks are positively correlated with contemporaneous return shocks and negatively correlated with shocks to the dividend yield. We consider a simple asset-pricing model with liquidity and the market portfolio as risk factors and transaction costs that are proportional to liquidity. The model differentiates between integrated and segmented countries and time periods. Our results suggest that local market liquidity is an important driver of expected returns in emerging markets, and that the liberalization process has not fully eliminated its impact.]

Firm characteristics, consumption risk, and firm-level risk exposures

Journal of Financial Economics 2017 125(2), 326-343
We propose a novel approach to measuring firm-level risk exposures and costs of equity. Using a simple consumption-based asset pricing model that explains nearly two-thirds of the variation in average returns across 55 anomaly portfolios, we map the relation between exposures to consumption risk and portfolio-level characteristics. We use this relation to calculate exposures to consumption risk at the firm level and show that the calculated consumption risk exposures yield portfolios with large differences in average returns and ex post consumption risk exposures consistent with those predicted by our calculated betas. Further, industry betas and risk premia implied by our procedure display economically intuitive variation over time. Finally, Fama-MacBeth regressions suggest that risk exposures calculated using our procedure dominate those from alternative factor models at explaining cross-sectional variation in returns.

What Segments Equity Markets?

Review of Financial Studies 2011 24(12), 3841-3890
[We propose a new, valuation-based measure of world equity market segmentation. While we observe decreased levels of segmentation in many countries, the level of segmentation remains significant in emerging markets. We characterize the factors that account for variation in market segmentation both through time as well as across countries. Both a country's regulation with respect to foreign capital flows and certain nonregulatory factors are important. In particular, we identify a country's political risk profile and its stock market development as two additional local segmentation factors as well as the U.S. corporate credit spread as a global segmentation factor.]

Why do term structures in different currencies co-move?

Journal of Financial Economics 2015 115(1), 58-83
Yield curve fluctuations across different currencies are highly correlated. This paper investigates this phenomenon by exploring the channels through which macroeconomic shocks are transmitted across borders. Macroeconomic shocks affect current and expected future short-term rates as central banks react to changing economic environments. Investors could also respond to these shocks by altering their required compensation for risk. Macroeconomic shocks thus influence bond yields both through a policy channel and through a risk compensation channel. Using data from the US, the UK, and Germany, we find that world inflation and US yield level together explain over two-thirds of the covariance of yields at all maturities. Further, these effects operate largely through the risk compensation channel for long-term bonds.

Regulatory pressure and fire sales in the corporate bond market

Journal of Financial Economics 2011 101(3), 596-620
This paper investigates fire sales of downgraded corporate bonds induced by regulatory constraints imposed on insurance companies. As insurance companies hold over one-third of investment-grade corporate bonds, the collective need to divest downgraded issues may be limited by a scarcity of counterparties. Using insurance company transaction data, we find that insurance companies that are relatively more constrained by regulation are more likely to sell downgraded bonds. Bonds subject to a high probability of regulatory-induced selling exhibit price declines and subsequent reversals. These price effects appear larger during periods when the insurance industry is relatively distressed and other potential buyers' carpital is scarce.

Taper Tantrums: Quantitative Easing, Its Aftermath, and Emerging Market Capital Flows

Review of Financial Studies 2021 34(3), 1445-1508
This paper examines the spillover effects of U.S. unconventional monetary policy (UMP) on emerging market capital flows and asset prices. Affine term structure model estimates show that U.S. monetary policy shocks, identified with high-frequency Treasury futures data, represent revisions to expected short-term yields and term premia, especially during the UMP period. The policy shocks exhibit sizable effects on U.S. holdings of emerging market assets. These effects disproportionately manifest through valuation changes versus physical flows, are more pronounced for equity relative to bond markets, and are asymmetric between the quantitative easing and tapering periods, with flows more important during the unwinding.

How Does Human Capital Affect Investing? Evidence from University Endowments

Review of Finance 2023 27(1), 143-188 open access
We examine the links between human capital and endowment investing. Harnessing detailed information on university endowments, we find that higher asset allocations to alternative assets accompany higher levels of human capital in the endowment’s investment process. Moreover, high levels of human capital are linked to larger returns, even on a risk-adjusted basis. The improved investment outcomes arise because endowments (i) capture higher returns that can accompany alternative assets, (ii) select or have access to high performing managers, and (iii) minimize fees by accessing funds directly rather than through funds of funds. Our measures of human capital include expertise in alternatives on governing bodies, the presence of a chief investment officer, and the size of the investment staff. Finally, we conduct a novel survey of endowments and confirm that human capital is central in facilitating alternative investments.

Crowded Trades and Tail Risk

Review of Financial Studies 2022 35(7), 3231-3271
Hedge fund positions are an important component of crowded trades. These vehicles are particularly active, take highly concentrated positions, and utilize leverage and short sales. Using a database of hedge fund holdings, we measure the degree of security-level crowdedness. The difference between the average returns on portfolios sorted by high versus low crowdedness portfolios is sizable, and the variation in the realized portfolio returns is distinct from other traditional risk factors. Further, hedge fund exposures to crowdedness are often significant, and they help to explain downside “tail risk,” as funds with higher exposures experience relatively larger drawdowns during periods of industry distress.

Heterogeneous Taxes and Limited Risk Sharing: Evidence from Municipal Bonds

Review of Financial Studies 2021 34(1), 509-568
We evaluate the impacts of tax policy on asset returns using the U.S. municipal bond market. In theory, tax-induced ownership segmentation limits risk sharing, creating downward-sloping regions of the aggregate demand curve for the asset. In the data, cross-state variation in tax privilege policies predicts differences in in-state ownership of local municipal bonds; the policies create incentives for concentrated local ownership. High tax privilege states have muni bond yields that are more sensitive to variations in supply and local idiosyncratic risk. The effects are stronger when local investors face correlated background risk and/or diminishing marginal nonpecuniary benefits from holding local assets.