Ben dropped the matter, stonkered by the simplicity of the arrangement.  He already had some idea, from Mike and second-hand from Jill and Jubal, of the moneyless communism of the Martian culture; he could see that Mike had set up an enclave of it here - and these bowls of cash marked the transition point whereby one passed from Martian to Terran economy.  He wondered if Patty knew that it was a fake... bolstered up by Mike's enormous fortune.  He decided not to ask.