It's difficult to comprehend sometimes what the modern Walmart is. I think of it as an aircraft hangar filled with merchandise at sometimes absurd prices. It's like that Brit says in the column: one is tempted to presume in looking at the prices that the staff can't do their sums.
I recall reading back in the cold war days, that one of the hardest thing refugees from the Soviet block had trouble adjusting to was our supermarkets.