The Pet Rock: How to Make Big Money From Simple Ideas

In 1975, the pet rock sold 1.5 million units at $3.95 a pop. And even though it was a fad that lasted only 6 months, it made the inventor, Gary Dahl, a millionaire overnight. It’s one of those ideas so simple you think, “Man, why couldn’t I have come up with that?!?!” Most people will chalk […]

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