Quite. And for the past 20 years, it's been Saturday, too, because they are open on Sundays so many workers don't get a full weekend.
And the longer and more often people work 24/7, the more they will be expected to do it, rather than, say, Tuesday. Yes, it's nice having a Tuesday off but you have no one to spend it with because other people are working then.
And with the erosion of 9-5 structures, most supermarkets and other retailers have stopped premium pay. Sunday working is no longer a treat, which is rewarded.
This is all because people want to shop when they want and where they want and have it as cheap as they want.
Yes, minimum wages are going up but with that, many supermarkets have taken away the paid element of breaks so the money is the same.
The discounters have driven prices right down but, with that, they have driven down wages, too, right across the board.