Because we have always done it that way... For the $2B+ in dollar coins to take traction, eliminate the paper one dollar bill. Save one dollar bill printing and disposal costs, etc. Save coin storage and handling costs: $650,00 for new storage, $3M for armored truck contractors, $1.4M for pallets and bldg removations, etc. Let's pay down the debt and this is one painless way idea that will help.
Idea No. 6665