Comment by jltsiren

Coordination problems become easier when there is a pressing need to solve them.

If pennies are phased out, companies need to figure out how to do business without pennies. If they can't find a legal way to continue business, they will tell the relevant legislators that the laws should be changed. If the legislators don't see a reason to change the laws, the companies will probably stop doing business in that jurisdiction. If the legislators still don't see a reason to change the laws, then the outcome is probably what the local residents wanted.