Do you think Walmart’s prices are higher than you’d pay if there were just ten competing stores with the same product mix, each of which did not have the leverage to squeeze suppliers?
It doesn't matter what Walmart's prices would be -- because there'd be nine alternatives offering their products at different price points. Also, you seem to be implying that suppliers are inhuman and deserve to be squeezed (but Walmart somehow deserves all the wealth it extracts as a middle-man, go figure), which is exactly why I said that focusing on consumers only is a myopic view of the world.