We examine the implications of portfolio theory for the cross-sectional behavior of equity trading volume. Two-fund separation theorems suggest a natural definition for trading activity: share turnover. If two-fund separation holds, share turnover must be identical for all securities. If (K + 1)-fund separation holds, we show that turnover satisfies an approximately linear K-factor structure. These implications are examined empirically using individual weekly turnover data for NYSE and AMEX securities from 1962 to 1996. We find strong evidence against two-fund separation, and a principal-components decomposition suggests that turnover is well approximated by a two-factor linear model.

[This article studies the design and valuation of debt contracts in a general dynamic setting under uncertainty. We incorporate some insights of the recent corporate finance literature into a valuation framework. The basic framework is an extensive form game determined by the terms of a debt contract and applicable bankruptcy laws. Debtholders and equityholders behave noncooperatively. The firm's reorganization boundary is determined endogenously. Strategic debt service results in significantly higher default premia at even small liquidation costs. Deviations from absolute priority and forced liquidations occur along the equilibrium path. The design tends to stress higher coupons and sinking funds when firms have a higher cash payout ratio.]

[We analyze a competitive model in which different information signals get reflected in value at different points in time. If investors are sufficiently risk averse, we obtain an equilibrium in which all investors focus exclusively on the short term. In addition, we show that increasing the variance of informationless trading increases market depth but causes a greater proportion of investors to focus on the short-term signal, which decreases the informativeness of prices about the long run. Finally, we also explore parameter spaces under which long-term informed agents wish to voluntarily disclose their information.]

Abstract What has driven the dramatic rise in U.S. corporate cash? Using non-public data, we show that the run-up is not uniform across firms but is concentrated in the foreign subsidiaries of multinational firms. Standard precautionary motives explain only domestic cash holdings, not these burgeoning foreign cash balances. Falling foreign tax rates, coupled with relaxed restrictions on income shifting, are the root of the changing foreign cash patterns. Firms with intellectual property have the greatest ability to shift income to low tax jurisdictions, and their foreign subsidiaries are where we observe the largest accumulations of cash. Received September 6, 2017; editorial decision August 22, 2018 by Editor David Denis. Authors have furnished an Internet Appendix, which is available on the Oxford University Press Web site next to the link to the final published paper online.

Evaluating agency theory and optimal contracting theory views of corporate philanthropy, we find that as corporate giving increases, shareholders reduce their valuation of firm cash holdings. Dividend increases following the 2003 Tax Reform Act are associated with reduced corporate giving. Using a natural experiment, we find that corporate giving is positively (negatively) associated with CEO charity preferences (CEO shareholdings and corporate governance quality). Evidence from CEO-affiliated charity donations, market reactions to insider-affiliated donations, its relation to CEO compensation, and firm contributions to director-affiliated charities indicates that corporate donations advance CEO interests and suggests misuses of corporate resources that reduce firm value.

We examine the effect of a permanent change to a country corporate income repatriation tax system on corporate financial policies. In 2009, Japan and the United Kingdom switched from a worldwide system to a territorial system for the taxation of repatriated foreign earnings, effectively reducing the tax liabilities of most multinational firms when repatriating earnings. We find that after the change firms accumulate less cash, pay out larger amounts through dividends and share repurchases, and invest less abroad. We do not find that the tax system change has significantly affected domestic investments even when controlling for capital constraints.

[Using institutional investor demand as a proxy for revisions in sophisticated investors' expectations, we test whether financial strength information is gradually impounded over time. Consistent with the gradual incorporation of information, financial strength predicts both future returns and future institutional investor demand. Further consistent with the gradual incorporation of information, more sophisticated transient (high-turnover) institutions respond to financial strength signals prior to less sophisticated, nontransient institutions. A number of additional tests suggest that financial strength forecasts stock returns, at least in part, because it forecasts institutional demand, and institutional demand drives prices.]

[Mutual funds whose managers are in the same educational network as the firm's CEO are more likely to vote against shareholder-initiated proposals to limit executive compensation than out-of-network funds are. This voting propensity is stronger when voting among the funds in a family is not unanimous. Furthermore, CEOs of firms who have relatively high levels of educationally connected mutual fund ownership have higher levels of compensation than their unconnected counterparts. This aspect of executive compensation is related to both the abnormal trading performance of the connected investors in the firm and the perceived quality of firm management by the connected investors.]

[There is a strong inverse relation between insider trading and institutional demand the same quarter and over the previous year. Our analysis suggests a combination of factors contribute to this relation. First, institutional investors are more likely to provide the liquidity necessary for insiders to trade. Second, insiders are more likely to buy low valuation and low lag return stocks while institutions are attracted to the opposite security characteristics.Last, the results are consistent with the hypothesis that insiders are more likely to view their securities as overvalued (undervalued) following a period when institutions were net buyers (sellers).]

[This article advocates a theory of expectation formation that incorporates many of the central motivations of behavioral finance theory while retaining much of the discipline of the rational expectations approach. We provide a framework in which agents, in an asset pricing model, underparameterize their forecasting model in a spirit similar to Hong, Stein, and Yu (2007) and Barberis, Shleifer, and Vishny (1998), except that the parameters of the forecasting model and the choice of predictor are determined jointly in equilibrium. We show that multiple equilibria can exist even if agents choose only models that maximize (risk-adjusted) expected profits. A real-time learning formulation yields endogenous switching between equilibria. We demonstrate that a real-time learning version of the model, calibrated to U. S. stock data, is capable of reproducing regime-switching returns and volatilities, as recently identified by Guidolin and Timmermann]