• If people are worried about running out of mains water, they should probably be worried about not having power to run their freezers.

    I think you've nailed it. I think people get a little carried away and start buying more of everything and a supermarket supply chain is tailored to make sure that there is just enough on the shelves to satisfy demand to minimise wastage so it must take a while for them to adjust for an increase in demand.

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