The last-ever penny will be minted today in Philadelphia

I watched a video on the demise of the penny and its predicament was so succinctly explained: everyone gets pennies as change but few carry them around let alone spend them, so we are stuck producing ever more. One news outlet even did an "experiment" where they threw hundreds of pennies on the ground in a city on a busy morning and not one person stopped to pick any up.

> everyone gets pennies as change but few carry them around let alone spend them

It's not just pennies, it's all coins. In a former life I worked in retail and almost nobody would fish around in their pockets for exact (or even near) change. They'd always hand me bills for their purchase even if they had just completed a transaction and had the coins in their pocket. That was in the 90's, and I still see it happening today, even though I'm no longer in the retail world.

I’d regularly use quarters in vending machines, but not waste time during a retail transaction.