On the Industry Concentration of Actively Managed Equity Mutual Funds
研究1984至1999年美国主动管理型共同基金的行业集中度与业绩关系，发现集中度高的基金平均表现更好，表明投资能力在集中持仓的经理中更明显。
ABSTRACT Mutual fund managers may decide to deviate from a well‐diversified portfolio and concentrate their holdings in industries where they have informational advantages. In this paper, we study the relation between the industry concentration and the performance of actively managed U.S. mutual funds from 1984 to 1999. Our results indicate that, on average, more concentrated funds perform better after controlling for risk and style differences using various performance measures. This finding suggests that investment ability is more evident among managers who hold portfolios concentrated in a few industries.