How much money to be consider rich

This question has been bothering me a while. Always see my friend comparing who is richer than who. But, how do you define rich in the first place?
"Rich is defined as having a great deal of money or assets. However, how do we quantity how much money is consider 'rich'. Seeking expert opinions on this. How do you define rich? Or how much money do you think one must have to be consider 'rich""
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How much money to be consider rich

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