Amen on creativity. You can minimize risk by embellishing that which you already know. Kroc started selling wax paper cups before moving on to milkshake machines that used wax paper cups. One day he noticed that a San Bernardino diner owned not 1 but 8 milkshake machines. So a curious Kroc spent all day sitting in the parking lot spying on the McDonald brother's diner and the rest is history.
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Later all, thanks for the interesting thread.
Kroc was also obsessed with french fries.