I' ll take bitcoin as an example.
Is it mandatory that the value of all bitcoins is equal to the value of the world economy?
Can this value be archived before all the bitcoins are mined?
When I buy bitcoin someone will take my dollars.
So how can we technically replace all dollars with the bitcoins?
In the end will there always be someone with only dollars in their pockets or am i wrong?
One of the purpose of bitcoin is to served the unbanked, being a global currency is not mandatory by the bitcoin, it is something that the people of the world specially the Governments that will come up with one decision. the purpose of bitcoin is to act as a currency that the central banks failed to deliver to us. Why always dollar? i can buy bitcoin with yuan, euro, peso, rupee and other types of currency if you want you can trade your precious metals or assets for bitcoin, you can actually do that.