There's a good sushi place near me that gives a 10% discount for cash. I'm fascinated by this.

(I still use a card because life is short)

Unrecorded cash payment makes it much easier to pay undocumented staff

That may just be good old-fashioned tax evasion.

(If you pay cash, the business owner can just pocket the money without ever recording the transaction. For digital payments, this is much harder to do undetected.)

It's tax evasion.

First comment I see that addresses this. This is a big part of accepting and paying cash. Tax evation. From both sides.

Yeah I often see small print on the fuel cost per gallon as "cash price" .. I assume this happens mostly on low-margin products.

Where I live there's a mom and pop (well, mom and daughter) shop that sells relatively expensive clothes. They stopped accepting Amex because fees were too high, yet they basically apply a 5-10% discount by default if you spend enough...