What This Country Needs is an 18¢ Piece[1]

[1] https://graal.ens-lyon.fr/~abenoit/algo09/coins1.pdf

With inflation about to go up to absolutely insane levels, it might be reasonable to round cash transactions to dollars. Cash is still essential for transactions without requiring technology, creating traceable metadata, or disadvantaging the unbanked.

Let's wait until it's a problem. You can round up to the nearest dollar if you want to.

I think we should jump straight to hundred dollar bills at this rate

That will be next year. The year after that, America be buying things in units of wheelbarrows of bricks of hundreds before switching to the Zimbabwean dollar. ;)

I haven’t used coins since about 2009 (I mostly pay with card or phone, and if I don’t, I just leave the change behind.). The exception to the rule was probably some tolls and parking meters. I’d probably ditch but quarters. Those still make sense otherwise I’d expect all the points where you can pay with coins to jack up the prices to the nearest dollar, regardless of how you pay (and each item individually).

I also don’t know how I feel about $1 coins. One buck has such a low value in these days that it almost doesn’t make sense to have it in “paper” but I cannot imagine going back to coins.