The value of the dollar has fallen over the years to the point where most of the coins are too worthless to produce. As things stand, coins are just a nuisance in cash transactions, and price differences in pennies are meaningless.
An easy fix for this is to rebase the currency by 10:1, effectively "dropping a zero" from current prices. A new penny would be worth ten of today's cents. Ten of today's dollars would be worth one new dollar. Gas would be 30 cents a gallon.
There are various ways this could be done. One possibility:
* A new series of paper bills can be issued with different designs, indicating they are worth 10 of the old bills.
* We can simply revalue pennies and nickels. It would be a small economic stimulus and save costs.