Kapitalism

[vetran]

Well it all it needs to screw up one supermarket chain is for a couple of companies like Unilever and Nestle of which I think you'll find many of the products on the shelves come from:

Unilever: View brands | Brands in action | UK & Ireland
Nestle: Brands

And for them to say to supermarket A that they will no longer provide their products to them if they continue with this practice, then go to supermarket B and offer them discounts of their products if they don't use this practice. Supermarket B can then offer the goods to the consumer at a decent price and supermarket A will go tits-up...

And supermarket A will do a temporary deal with with L'Oreal whilst building up a an own brand or presonalised brand to replace them. Not as many people as you think are brand loyal. But yes that is the way to weaken the Supermarket's hold.

[SpontaneousOrder]

They wield such power because of their market share.

You're just begging the question. So do they have such power, from such a market share, because of their uncompetitiveness ?