02319cam a22002537 4500001000700000003000500007005001700012008004100029100002000070245015100090260006600241490004200307500001900349520123800368530006101606538007201667538003601739690007401775700002201849710004201871830007701913856003801990856003702028w11144NBER20150707203033.0150707s2005 mau||||fs|||| 000 0 eng d1 aLettau, Martin.10aWhy is Long-Horizon Equity Less Risky? A Duration-Based Explanation of the Value Premiumh[electronic resource] /cMartin Lettau, Jessica Wachter. aCambridge, Mass.bNational Bureau of Economic Researchc2005.1 aNBER working paper seriesvno. w11144 aFebruary 2005.3 aThis paper proposes a dynamic risk-based model that captures the high expected returns on value stocks relative to growth stocks, and the failure of the capital asset pricing model to explain these expected returns. To model the difference between value and growth stocks, we introduce a cross-section of long-lived firms distinguished by the timing of their cash flows. Firms with cash flows weighted more to the future have high price ratios, while firms with cash flows weighted more to the present have low price ratios. We model how investors perceive the risks of these cash flows by specifying a stochastic discount factor for the economy. The stochastic discount factor implies that shocks to aggregate dividends are priced, but that shocks to the time-varying price of risk are not. As long-horizon equity, growth stocks covary more with this time-varying price of risk than value stocks, which covary more with shocks to cash flows. When the model is calibrated to explain aggregate stock market behavior, we find that it can also account for the observed value premium, the high Sharpe ratios on value stocks relative to growth stocks, and the outperformance of value (and underperformance of growth) relative to the CAPM. aHardcopy version available to institutional subscribers. aSystem requirements: Adobe [Acrobat] Reader required for PDF files. aMode of access: World Wide Web. 7aG1 - General Financial Markets2Journal of Economic Literature class.1 aWachter, Jessica.2 aNational Bureau of Economic Research. 0aWorking Paper Series (National Bureau of Economic Research)vno. w11144.4 uhttp://www.nber.org/papers/w1114441uhttp://dx.doi.org/10.3386/w11144