What is truly discouraging — or reassuring? — is the considerable evidence that the universe of those who seek to be "timers," and vary the fractional shares of their portfolios committed to common stocks in the hope of enlarging average long-term total return, in fact fail to achieve on the average any plus gain in comparison with simply buying and holding a fixed fraction of common stocks.

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Quote text and notes from Wikiquote: Paul Samuelson (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.