Like many states, Federal Government announced today that all recipients of monetary benefits will no longer have the option of getting checks in the mail. There will be no more paper checks sent out effective next year. Those with no bank account for direct deposit will get "debit" cards. Only tax refunds will be exempt, but the IRS is encouraging everyone getting refunds to go digital. I expect it be required soon. Probably within ten years there will no longer be any "currency" in circulation. Science fiction writer Robert A. Heinlein wrote about this, as did others, in the 1960's.
Oh, and get ready to sell shares of any cash register maker you may have. We won't need them. With smart phones that process cards and technology we don't have yet, cash is going the way of the Do Do bird.
What will this mean in calculating M-1 and supply/demand for "money" and deposits if large sums are issued and carried on cards?