Time-varying risk premia and the cost of capital

An alternative implication of the Q theory of investment

Martin Lettau, Sydney Ludvigson

    Research output: Contribution to journalArticle

    Abstract

    Evidence suggests that expected excess stock market returns vary over time, and that this variation is much larger than that of expected real interest rates. It follows that a large fraction of the movement in the cost of capital in standard investment models must be attributable to movements in equity risk-premia. In this paper we emphasize that such movements in equity risk premia should have implications not merely for investment today, but also for future investment over long horizons. In this case, predictive variables for excess stock returns over long-horizons are also likely to forecast long-horizon fluctuations in the growth of marginal Q, and therefore investment. We test this implication directly by performing long-horizon forecasting regressions of aggregate investment growth using a variety of predictive variables shown elsewhere to have forecasting power for excess stock market returns.

    Original languageEnglish (US)
    Pages (from-to)31-66
    Number of pages36
    JournalJournal of Monetary Economics
    Volume49
    Issue number1
    DOIs
    StatePublished - 2002

    Fingerprint

    Time-varying risk
    Risk premia
    Cost of capital
    Equity risk
    Stock market returns
    Stock returns
    Aggregate investment
    Fluctuations

    Keywords

    • Investment
    • Q-theory
    • Risk-premia

    ASJC Scopus subject areas

    • Finance
    • Economics and Econometrics

    Cite this

    Time-varying risk premia and the cost of capital : An alternative implication of the Q theory of investment. / Lettau, Martin; Ludvigson, Sydney.

    In: Journal of Monetary Economics, Vol. 49, No. 1, 2002, p. 31-66.

    Research output: Contribution to journalArticle

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