Just a reminder to all ... if/when the internet goes down, so does ALL of our infrastructure. Our entire way of life is controlled by computer systems - power grid, water systems, cash registers, banks, on & on - EVERYTHING.
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Debit/credit cards for purchases.
Have some of that worthless fiat on hand. About 3 months worth of what you think you will need.
but even with cash (most) the stores can't scan items to ring up purchases.
I don't expect there to be anything left on the shelves or anybody to guard the stores once the internet goes down. It will be absolute mayhem. The average person less than 3 days of supplies and supermarkets about 1 week.
I heard a lecture that stores will only accept the exact amount or over. In other words you wont get change back. Keep coins handy too. Finally pennies will be useful.