Overlooked in the disaster...
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I remember in the August 2003 blackout in NYC the ATMs were all down. I happened to have a few hundred in 20s and gave a 20 or two to a bunch of people I worked with to help them get home.
After that I made a habit of keeping a stack of 20s hidden in the house. I’d occasionally use them to get a discount with a tradesman. At some point I ran out and didn’t replenish.
Maybe I should.