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Interesting question! For become rich inner motivation is required. If a person firmly think that it's time to do something than he can do everything and by his hard work he become rich.

A person can earn money by many sources - business , professional life, illigal work , and 10000 sources available for become rich.

But if a person satisfied and happy than he is rich otherwise a millionaire can't be rich.

To be a good person, and happier, then to be rich.