Looking at the world I realize there is an economy for each country and we all have currency. Of course, being a normal human being who has grown up knowing this is the way the world works, I never questioned it... Until now. I have always acknowledged the fact that I use money to buy commodities but never asked "Why?"
So why did the economy start, how did it start, and is it even necessary?
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Because people want gratification. People want money. Or in the old old days, people want something better than what they are giving up. People want to feel like they gained something.