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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It's an evolution of the bartering system. I can fix your fence for two chickens, but what if I don't need two chickens? What are two chickens worth in milk? And what do I do the next time I go to fix a fence for someone and they don't have chickens or milk?