But they were losing anyway. What did they have to lose?
It's extremely unlikely lower income salaries will increase. There will be no increase in benefits, tax credits etc, i think thats clear.
However, we are due inflation. We are already seeing sharp increases in home energy prices, as oil and gas is priced in dollars. Supermarkets are currently holding back price rises to consumers, and gradually phasing them in. They don't want to be the first to blink and be branded the anti brexit supermarket by the knuckle dragging daily mail readers. I work with one of the big supermarkets and have been told this, but i dont think it's much of a secret. Tesco has more resources to maintain this for longer, but is not indefinite.
So with no increases in income and an increase in costs, they are almost certainly going to lose. Unfortunately i think they will feel it more acutely than anyone else.
I think it was highly irresponsible of people like Martin Lewis to claim, you have nothing to lose. Clearly they do.