[This article documents differences between the Q-sensitivity of investment of stand-alone firms and unrelated segments of conglomerate firms. Unrelated segments exhibit lower Q-sensitivity of investment than stand-alone firms. This fact is driven by unrelated segments of conglomerate firms that tend to invest less than stand-alone firms in high-Q industries. This finding is robust to matching on industry, year, size, age, and profitability. The differences are more pronounced in conglomerates in which top management has small ownership stakes, suggesting that agency problems explain the investment behavior of conglomerates.]

This article documents differences between the Q-sensitivity of investment of stand-alone firms and unrelated segments of conglomerate firms. Unrelated segments exhibit lower Q-sensitivity of investment than stand-alone firms. This fact is driven by unrelated segments of conglomerate firms that tend to invest less than stand-alone firms in high-Q industries. This finding is robust to matching on industry, year, size, age, and profitability. The differences are more pronounced in conglomerates in which top management has small ownership stakes, suggesting that agency problems explain the investment behavior of conglomerates.

[This article, which introduces the special issue on corporate governance cosponsored by the Review of Financial Studies and the National Bureau of Economic Research (NBER), reviews and comments on the state of corporate governance research. The special issue features seven articles on corporate governance that were presented in a meeting of the NBER's corporate governance project. Each of the articles represents state-of-the-art research in an important area of corporate governance research. For each of these areas, we discuss the importance of the area and the questions it focuses on, how the article in the special issue makes a significant contribution to this area, and what we do and do not know about the area. We discuss in turn work on shareholders and shareholder activism, directors, executives and their compensation, controlling shareholders, comparative corporate governance, cross-border investments in global capital markets, and the political economy of corporate governance.]

[We investigate corporate financial policies in the presence of both temporary and permanent shocks to firms' cash flows. In our framework, cash flows can be negative and are imperfectly correlated with firm value, and earnings volatility differs from asset volatility. These results are consistent with empirical stylized facts. They are also contrary to the implications of existing dynamic capital structure models that allow only for permanent shocks to cash flows. Temporary shocks increase the importance of financial flexibility and may provide an intuitively simple and realistic explanation of empirically observed financial conservatism and low leverage phenomena. The theoretical framework developed in this article general enough to be used in various corporate finance applications.]

[We embed a structural model of credit risk inside a dynamic continuous-time consumptionbased asset pricing model, which allows us to price equity and corporate debt in a unified framework. Our key economic assumptions are that the first and second moments of earnings and consumption growth depend on the state of the economy, which switches randomly, creating intertemporal risk, which agents prefer to resolve sooner rather than later, because they have Epstein-Zin-Weil preferences. Agents optimally choose dynamic capital structure and default times. For a dynamic cross-section of firms, our model endogenously generates a realistic average term structure and time series of actual default probabilities and credit spreads, together with a reasonable levered equity risk premium, which varies with macroeconomic conditions.]

[The empirical evidence on the cross-sectional relation between idiosyncratic risk and expected stock returns is mixed. We demonstrate that the omission of the previous month's stock returns can lead to a negatively biased estimate of the relation. The magnitude of the omitted variable bias depends on the approach to estimating the conditional idiosyncratic volatility. Although a negative relation exists when the estimate is based on daily returns, it disappears after return reversals are controlled for. Return reversals can explain both the negative relation between value-weighted portfolio returns and idiosyncratic volatility and the insignificant relation between equal-weighted portfolio returns and idiosyncratic volatility. In contrast, there is a significantly positive relation between the conditional idiosyncratic volatility estimated from monthly data and expected returns. This relation remains robust after controlling for return reversals.]

[We study the impact of time-varying macroeconomic conditions on optimal dynamic capital structure for a cross-section of firms. Our structural-equilibrium framework embeds a contingent-claim corporate financing model within a consumption-based asset-pricing model. We investigate the effect of macroeconomic conditions on asset valuation and optimal corporate policies, and of preferences on capital structure. While capital structure is pro-cyclical at dates when firms re-lever, it is counter-cyclical in aggregate dynamics, consistent with empirical evidence. We also find that financially constrained firms choose more pro-cyclical policies and that leverage accounts for most of the macroeconomic risk relevant for predicting defaults, but is a poor measure of how preferences impact capital structure.]

We investigate corporate financial policies in the presence of both temporary and permanent shocks to firms’ cash flows. In our framework, cash flows can be negative and are imperfectly correlated with firm value, and earnings volatility differs from asset volatility. These results are consistent with empirical stylized facts. They are also contrary to the implications of existing dynamic capital structure models that allow only for permanent shocks to cash flows. Temporary shocks increase the importance of financial flexibility and may provide an intuitively simple and realistic explanation of empirically observed financial conservatism and low leverage phenomena. The theoretical framework developed in this article general enough to be used in various corporate finance applications.

This article, which introduces the special issue on corporate governance cosponsored by the Review of Financial Studies and the National Bureau of Economic Research (NBER), reviews and comments on the state of corporate governance research. The special issue features seven articles on corporate governance that were presented in a meeting of the NBER’s corporate governance project. Each of the articles represents state-of-the-art research in an important area of corporate governance research. For each of these areas, we discuss the importance of the area and the questions it focuses on, how the article in the special issue makes a significant contribution to this area, and what we do and do not know about the area. We discuss in turn work on shareholders and shareholder activism, directors, executives and their compensation, controlling shareholders, comparative corporate governance, cross-border investments in global capital markets, and the political economy of corporate governance.

[We study the importance of time-varying bond risk premia in a consumption and portfoliochoice problem for a life-cycle investor facing short-sales and borrowing constraints. Tilts in the optimal asset allocation in response to changes in bond risk premia exhibit pronounced life-cycle patterns. We find that the investor is willing to pay an annual fee up to 1% to implement a strategy that optimally conditions on prevailing bond risk premia in addition to her age and wealth. To solve our model, we extend recently developed simulation-based techniques to life-cycle problems featuring multiple state variables and multiple risky assets.]