Why do people equate money with happiness?

People kill each other over money. people disown their children and grandchildren over money ( I know that from my life situation). Taxes out the ass, people always using you for it, turning into a godless a hole just to impress people who pretend to be your friend so you can get into a club because you think you're better than everyone. What's wrong with middle class?

Why do people equate money with happiness?
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