People explain money in different ways.
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When I was small, the meaning was simple, Go to the shopkeeper, give this paper thingy, get goods in return. Father has such paper. Period.
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Naval Ravikant, describes money as “a value that the society owes you because you did something for society”. No construct of paper, coin, currency. If you invest in a company, and you benefit in stocks. The society is saying that you gave us what we “owed” and the company did good for the world and now we owe you more.
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Morgan Housel, has eliminated the maths part and says that money is more psychological thing than a logical one.