Does Marx teach that anywhere in his writings?
What i remember is "from each according to their abilities, to each according to his needs", so when does "distributing equally" come in?
Marx does outline under the manifesto that having a central bank is a key tenant of communism.

If this was free market capitalism, there would be many banks offering many currencies. (You may have heard of the Dixie, at that time there were many banks, and many currencies)

All animals are equal, but some animals are more equal than others.