I’m very good at making baskets. I can make 10 baskets each day. You’re very good at making chairs. You can make 10 chairs each day. We both want to have baskets *and* chairs.
I’m not so great at making chairs. I can make 4 per day if I put all my effort into chairs. But if I do that, I’m not making baskets. So on my own, I could maybe manage 2 chairs, and 5 baskets. Likewise, you on your own could do 2 baskets, and 5 chairs.
But if I make 10 baskets, and you make 10 chairs, and we then give each other half of our product, we both have 5 baskets and 5 chairs, and are thus both ahead.
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