This study tests the Miller (1977) hypothesis as an explanation for stock price behavior around technology firms’ earnings announcements during the late 1990s. Specifically, we examine whether the anomalous tendency for stock prices to increase (decrease) before (after) earnings announcements during this period is associated with an increase (decrease) in investor disagreement before (after) th...

The use of valuation has an externality: it creates information on which adverse selection can occur. We study a market in which investors provide external financing for real investment projects. A subset of investors, sophisticated investors, can buy a technology to value a given number of projects, and reject those with low payoffs, Because rejected projects can seek funding from other invest...

This paper models the attention allocation of portfolio investors. Investors choose the composition of their information subject to an information flow constraint. Given their expected investment strategy in the next period, which is to hold a diversified portfolio, in equilibrium investors choose to observe one linear combination of asset payoffs as a private signal. When investors use this pr...

Using brokerage account data, we analyze the tax awareness of individual investors. We find strong evidence that taxes matter: investors prefer to locate bonds and mutual funds in retirement accounts and, in December, harvest stock losses in their taxable accounts. However, investors also trade actively in their taxable accounts, realize gains more frequently than losses, and locate a material ...

This paper examines optimal policy when agents, private investors and a government, can learn about the economy by observing others. Investors can delay investment in order to exploit future information. Importantly, investors ignore the informational value of their actions to others when deciding: this externality results in inefficiently high delay, motivating government intervention. The gov...

This paper presents a dynamic asset-pricing model under asymmetric information. Investors have different information concerning the future growth rate of dividends. They rationally extract information from prices as well as dividends and maximize their expected utility. The model has a closed-form solution to the rational expectations equilibrium. We find that existence of uninformed investors ...

Keywords: Robust optimization Mean–variance portfolio theory Ellipsoidal uncertainty Equilibrium price system a b s t r a c t In a financial market composed of n risky assets and a riskless asset, where short sales are allowed and mean–variance investors can be ambiguity averse, i.e., diffident about mean return estimates where confidence is represented using ellipsoidal uncertainty sets, we de...

Recent research documents that institutional or large investors act as antagonists to other investors by showing opposite trading behavior following disclosure of new information. Using an extremely comprehensive official transactions data set from Finland, we set out to explore the interrelation between investor size and behavior. More specifically, we test whether investor size is positively ...

T paper uses a formal model to study how evaluation costs affect competition for resources in strategic factor markets. It finds that relative scarcity may not always benefit resource sellers. Rather, when competition among resource investors passes a certain threshold intensity, miscoordination among investors increases to the point that sellers’ expected profits decline. This paper extends th...

This paper presents a model of portfolio choice and stock trading volume with lossaverse investors. The demand function for risky assets is discontinuous and non-monotonic: as wealth rises beyond a threshold investors follow a generalized portfolio insurance strategy. This behavior is consistent with the evidence in favor of the disposition effect. In addition, loss-averse investors will not ho...