Information Diffusion Effects in Individual Investors' Common Stock Purchases Covet Thy Neighbors' Investment Choices

We study the relation between households' stock purchases and stock purchases made by their neighbors. A ten percentage point increase in neighbors' purchases of stocks from an industry is associated with a two percentage point increase in households' own purchases of stocks from that industry. The effect is considerably larger for local stocks and among households in more social states. Controlling for area sociability, households' and neighbors' investment style preferences, and the industry composition of local firms, we attribute approximately one-quarter to one-half of the correlation between households' stock purchases and stock purchases made by their neighbors to word-of-mouth communication.

Information Diffusion Effects in Individual Investors' Common Stock Purchases: Covet Thy Neighbors' Investment Choices

Using data on stock purchases individual investors made through a discount broker from 1991 to 1996, we study information diffusion effects the relation between household investment choices and those made by their neighbors. A ten percentage point increase in neighbors' purchases of stocks from an industry is associated with a two percentage point increase in the household's own purchases of stocks from that industry, with the effect considerably larger for purchases of local stocks. The presence of information diffusion effects is robust to controls for potential inside information effects and to household fixed effects. Upon controlling for aggregate trading patterns, households' and neighbors' investment style preferences, and the industry composition of local firms, we attribute approximately one-third to one-half of the overall diffusion effect to word-of-mouth communication. Disentangling the overall diffusion effect suggests that the significant relation between our measures of information diffusion and subsequent industry-level returns appears to be driven by its word-of-mouth component.

Local Does as Local Is: Information Content of the Geography of Individual Investors' Common Stock Investments

Using a data set on the investments made by a large number of retail investors from 1991 to 1996, we find that households exhibit a strong preference for local investment - the average household invests nearly a third of their portfolio in firms headquartered within 250 miles. We test whether this locality bias is driven by information or by simple familiarity. The average household generates an additional return of 3.7% per year from its local holdings relative to its non-local holdings, suggesting local investors are able to exploit local knowledge. The excess return to investing locally is even larger among stocks not in the S&P 500 index (firms where informational asymmetries between local and non-local investors may be largest), while there is no excess return earned by households that invest in local S&P 500 stocks.

Portfolio Concentration and the Performance of Individual Investors

Using data on the investments a large number of individual investors made through a discount broker from 1991 to 1996, we find that the stock trades by households with concentrated portfolios outperform those with diversified portfolios. While in general the stocks bought by individual investors significantly underperform the stocks they sell, the reverse is true for households whose holdings are concentrated in a few stocks. The excess return of concentrated relative to diversified portfolios is stronger for households with large account balances as well as for stocks not included in the S&P 500 Index and local stocks, potentially reflecting concentrated investors' successful exploitation of information asymmetries. This finding is very robust to alternative concentration measures and regression specifications, and to alternative explanations such as differences across concentrated and diversified investors in the portfolio turnover and access to inside information, suggesting that some of these concentrated households have superior information processing skills. Moreover, controlling for a household's average investment ability, the household's trades perform better as the household's portfolio includes fewer stocks. However, while concentrated household portfolios on average outperform diversified ones, their levels of total risk are larger and the Sharpe ratios of their stock portfolios are lower.

Individual Investor Mutual-Fund Flows

This paper studies the relation between individuals' mutual fund flows and fund characteristics, establishing three key results. First, consistent with tax motivations, individual investors are reluctant to sell mutual funds that have appreciated in value and are willing to sell losing funds. Second, individuals pay attention to investment costs as redemption decisions are sensitive to both expense ratios and loads. Third, individuals' fund-level inflows and outflows are sensitive to performance, but in different ways. Inflows are related only to "relative" performance, suggesting that new money chases the best performers in an objective. Outflows are related only to "absolute" fund performance, the relevant benchmark for taxes.

Neighbors Matter: Causal Community Effects and Stock Market Participation

This paper establishes a causal relation between an individual's decision of whether to own stocks and average stock market participation decision of the individual's community. We instrument for the average ownership of an individual's community with lagged average ownership of the states in which one's non-native neighbors were born. Combining this instrumental variables approach with controls for individual and community fixed effects, a broad set of time-varying individual and community controls, and state-by-year effects, rules out alternative explanations. To further establish that word-of-mouth communication drives this causal effect, we show that the results are stronger in more sociable communities.

The Geography of Stock Market Participation: The Influence of Communities and Local Firms

This paper is the first to investigate the importance of geography in explaining equity market participation. We provide evidence to support two distinct local area effects. The first is a community ownership effect, that is, individuals are influenced by the investment behavior of members of their community. Specifically, a ten percentage-point increase in equity market participation of the members of one's community makes it two percentage points more likely that the individual will invest in stocks. We find further evidence that the influence of community members is strongest for less financially sophisticated households and strongest within peer groups' as defined by age and income categories. The second is that proximity to publicly-traded firms also increases equity market participation. In particular, the presence of publicly-traded firms within 50 miles and the share of U.S. market value headquartered within the community are significantly correlated with equity ownership of individuals. These results are quite robust, holding up in the presence of a wide range of individual and community controls, instrumental variables estimation, the inclusion of individual fixed effects, and specification checks to rule out that the relations are driven solely by ownership of the stock of one's employer.

Day Trading International Mutual Funds: Evidence And Policy Solutions

Daily pricing of mutual funds provides liquidity to investors but is subject to valuation errors due to the inability to observe synchronous, fair security prices at the end of the trading day. This may hurt fund investors if speculators strategically seek to exploit mispricing or if the net flow of money into funds is correlated with these pricing errors. We show that mutual funds are exposed to speculative traders by usin