They have now reached the point that they have huge economies of scale in the US--in fact suppliers cut their own throats to get Walmart contracts. (This has of course driven scads of jobs overseas to low-wage countries.) (As well as driving out of business lots of smaller stores which couldn't compete on price.)

Also they have huge penetration--Walmarts all across the US. In fact that's one of the problems they had in Germany--they were up against a German discounter, Aldi,--which has huge penetration in Germany. According to Nestle's research (Nestle being the world's biggest food maker), 80% of German consumers are 20 minutes from an Aldi.

And in the UK Tesco is able to keep loyalty by good prices, a loyalty card arrangement--do you know anything about that, by the way?-- and by being very sensitive to consumers' wants--e.g.--when they found out not just that not just Indians liked Indian food they started stocking more of it.

And as you know, even in the US there is opposition to Walmart.