The American economy was in recession, and the Dow Jones Industrial Average was yo-yo-ing in the 600s when Marjorie and Malcolm Gray found a new investment to offset a battering in the stock market. It was the spring of 1960, and after dropping by a neighbor’s home on Long Island to hear a couple of hopeful musicians play songs from their new Off Broadway musical, “The Fantasticks,” the Grays bought a stake in the show for $330.

The other day, 50 years later, Ms. Gray. now a widow, received her latest dividend from the musical, a $200 check in return for that stake. She has earned about $80,000 so far on the original $330 investment, or an average of $1,600 a year since 1960. And she will continue to receive money until 2020 because of the investment terms for the original production, which ran a record-setting 42 years at the Sullivan Street Playhouse in Greenwich Village.

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