Their profit margin is small.
But not as small as grocery stores -- groceries get a disproportionate share of their profits from personal care and 'sundries' ; I don't have access to the relative profitability of different product lines or departments at Wally World.
Cheers!
Excellent!
Perhaps you could show how WalMart's profit margins suddenly jumped when they "'encouraged' its suppliers to engage in wage arbitrage, pocketed the bulk of the savings, and passed a bit of the savings on to its consumers"
Since their percentage of foreign goods sold must be getting higher every year, according to some Freepers 100% of their goods are already from China, it should be easy to show that their profit margin is constantly rising.
Cheers!