“As a result of overdiversification, their (active managers) returns get watered down. Diversification covers up ignorance. Active managers haven't done enough research into any of their companies. If managers have 200 positions, do you think they know what's going on at any one of those companies at this moment?”
Quote by Bill Ackman
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Source: Pioneering Portfolio Management: An Unconventional Approach to Institutional Investment, Fully Revised and Updated
“All economic movements, by their very nature, are motivated by crowd psychology.”
Source: Common Sense on Mutual Funds
