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Existing studies in finance have documented the comovement of stock returns of companies headquartered in the same location. The interpretation is that local investors have a “local bias” due to an information advantage on local companies. This paper argues that localized agglomeration economies affect the fundamentals of local companies, resulting in the local comovement of stock returns. Using the data for China A-share listed companies from 1997-2007, we confirm the local comovement of stock returns of companies headquartered in the same city; moreover, the stock returns of a company headquartered in a city with stronger agglomeration economies are also correlated more highly with stock returns of other companies headquartered in the same city. The local comovement of earnings among companies headquartered in the same city is also found, and the local comovement of stock returns is correlated with the local comovement of earnings. We conclude that correlated local fundamentals due to localized agglomeration economies can explain the local comovement of stock returns.

Two competing hypotheses, value enhancing and value discounting, state that implementing socially responsible corporate policies can have positive or negative effects on firm value. This paper tests how a specific type of social responsibility–corporate equality–affects firm value. Corporate equality is measured by the corporate equality index (CEI). This index quantifies how companies treat their gay, lesbian, bisexual, and transgender employees, consumers, and investors. Using a sample of CEI-rated, publicly traded firms in the U.S., we find that, between 2002 and 2006, firms with a higher degree of corporate equality have higher stock returns and higher market valuation (Q). We provide suggestive, causal evidence that corporate equality enhances firm value through better performance in product markets and labor markets: Firms with a higher degree of corporate equality also tend to have larger sales, higher profit margins, higher employee productivity, and attract more employees. These results are robust to the inclusion of unobserved firm-heterogeneities. Overall, our results support the value-enhancing effects of corporate social responsibility.