1. Money already has a definition, a generally recognized medium of exchange. Gold and bitcoin are mediums of exchange, but they are not (yet, in bitcoin's case) generally recognized.
2. How do you define the market cap of dollars?
3. Market cap is a really poor measure of just about anything.
4. The concept you're referring to is related to the velocity of money[1].
1. Money already has a definition, a generally recognized medium of exchange. Gold and bitcoin are mediums of exchange, but they are not (yet, in bitcoin's case) generally recognized.
2. How do you define the market cap of dollars?
3. Market cap is a really poor measure of just about anything.
4. The concept you're referring to is related to the velocity of money[1].
[1] https://www.investopedia.com/terms/v/velocity.asp