Well, see the point is that
you can trade money for anything
but you can't trade anything for money
hence the term money as a medium of exchange is misleading.
On what terms do you define value? The term value is really subjective.This is what drives people to create things of value that people want and need, because that is what allows individuals to make money.
Gold and currency has been used as a medium of exchange ever since the dawn of time,. But the rise of capitalism has its roots back in the 19th and 20th century, So there must be something regarding the use of money or fundamental change in the laws of economics that drives us to prosperity.
I have not taken an economics class, and i am quite ignorant about the subject. But I do read economics books.