Everyone in the world is familiar with money, yet it is an extraordinarily rarer individual who understands what money is, how it is created, destroyed, managed, grown, shrunk, and why.
Also, money is not currency.
There's another ~$13 trillion in Checking, Savings, Money Market accounts.
There's ~$34 trillion in stocks.
There's ~$30 trillion in residential real estate.
There's ~$15 trillion in commercial real estate.
Amount of money that changes hands: $20 trillion
Amount of money Americans pay in federal taxes: $3.5 trillion
Amount of money govt spends: $4.5 trillion