Sometimes investing decisions are so simple, like taking a bite of a hamburger.

For William J. Wykle, Philadelphia-based managing director of PNC Bank Corp.'s Compass Capital small-cap equity fund, dropping into fast-food outlets has paid off twice. In the mid-1970s, he recalled, a visit to Wendy's resulted in this thought: "This is better than McDonald's." He bought the stock at $8 per share and sold at about $60.

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