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Linear Approximations and Tests of Conditional Pricing Models

Review of Finance 2018 22(2), 455-489
Abstract If a nonlinear risk premium in a conditional asset pricing model is approximated with a linear function, as is commonly done in empirical research, the fitted model is misspecified. We use a generic reduced-form model economy with moderate risk premium nonlinearity to examine the size of the resulting misspecification-induced pricing errors. Pricing errors from moderate nonlinearity can be large, and a version of a test for nonlinearity based on risk premiums rather than pricing errors has reasonable power properties after properly controlling for the size of the test. We conclude by examining the importance of moderate nonlinearity in the context of the investment-specific technology shock models of Papanikolaou (2011) and Kogan and Papanikolaou (2014).

The Impact of Liquidity Regulation on Bank Intermediation

Review of Finance 2016 20(5), 1945-1979
Abstract We analyze the impact of a requirement similar to the Basel III Liquidity Coverage Ratio on the bank intermediation applying Regression Discontinuity Designs. Using a unique dataset on Dutch banks, we show that a liquidity requirement causes long-term borrowing and lending rates as well as demand for long-term interbank loans to increase. Lower levels of aggregate liquidity increase the estimated effects. Short-term borrowing and lending rates only rise during periods of lower market-wide liquidity. Further, banks do not seem able to pass on the increased funding costs in the interbank market to their private sector clients. Rather, a liquidity requirement seems to decrease banks’ interest margins.

Optimal Value and Growth Tilts in Long-Horizon Portfolios

Review of Finance 2011 15(1), 29-74 open access
Abstract We develop an analytical solution to the dynamic portfolio choice problem of an investor with power utility defined over wealth at a finite horizon, who faces a time-varying investment opportunity set, parameterized using a flexible vector autoregression. We apply this framework to study the horizon effects in the allocations of equity-only investors, who hold a mix of value and growth indices, and a more general investor, who also has access to Treasury bills and bonds. We find that the mean allocation of equity-only investors is heavily tilted towards value stocks at short-horizons, but the magnitude of this tilt declines dramatically with the investment horizon, implying that growth is less risky than value at long horizons. Investors with access to bills and bonds exhibit similar behavior, when value and growth tilts are computed relative to the total equity allocation of the portfolio. However, after accounting for the propensity of these investors to increase their total equity allocation as the horizon increases, the mean value tilt of the optimal allocation is shown to be positive and stable across time.

A Proposal for Extending the Theory of the Firm

Quarterly Journal of Economics 1951 65(1), 87
I. Introduction, 87. — II. The business firm as organization, 89. — III. Control and costs, 91. — IV. Standard costs, 94. — V. Agent behavior, 98. — VI. Multiple commodity production and multiple agents — horizontal case, 103. — VII. Multiple agents — vertical case, 105. — VIII. Conclusion, 109.