Canada cuts pennies
Canada eliminates pennies, prepares to cut nickels.We could easily phase out pennies, nickels and dimes. Quarters probably deserve to stay because they're still used in some vending machines and they're still a halfway meaningful unit of value.
How to make it work: Program cash registers so they round up or down RANDOMLY. Then the customer and the store would each get the advantage half the time, and both would come out even in the long run.
Females would have trouble with this procedure because females don't understand math, but it would be irrelevant because females never pay with cash. Older females pay by check, younger ones with food stamp debit cards.