Remember the Susan B Anthony dollar? It was "slightly" bigger than a quarter. There were plenty of people asking for change for a dollar and the unsuspecting person handed them four Susan B Anthony dollars. A very nice profit margin for some and a large embarrassing loss for others.Elimination of paper dollar and replace with dollar coin - a coin only slightly bigger than quarter, or, slightly smaller than a quarter with a dual metal design.
The dollar coins I had in Las Vegas are slightly larger than a quarter. I still have a roll of them.