The first decade or so of human habitation of Mars, if it ever happens, will be a controlled environment not unlike being in the Navy on a ship at sea. 

When I was in the Navy, I locked up my wallet when we put out to sea and didn't touch it again until we neared port.  There was no need for money at sea.  And so it shall be on Mars (for a while).

Did the astronauts bring any dollars with them to the moon?