Active investors, as a group, must by definition underperform a strategy that passively holds a market portfolio of stocks, since active investors incur greater transaction costs. The reduced liquidity of small companies or emerging country stocks incurs higher transaction costs, making it even more difficult to outperform a passive strategy.
Source: http://www.investorguide.com/igu-article-995-stock-strategies-active-versus-passive-management.html
Tags: active management
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