An exercise on business opportunity recognition in the subject of entrepreneurship

A class exercise on business opportunity recognition (in the subject of entrepreneurship):

Question: Siu Ming was offered to choose one of two gift options: a fish or US$500. Siu Ming finally chose the fish instead of US$500. Why?

Answer: because Siu Ming is a cat.

Lesson learned: business opportunity is not an objective phenomenon independent of the cognitive condition of the decision-maker.