I would bet that a large part of that money goes to pay corporate taxes to line the pockets of the politicians. Is the problem that Walmart's prices are too high? ;-)
Which means that they ignore transportation costs, inventory financing costs, advertising costs, sales costs, leasing costs and taxes among other things.
You are able to buy that toy truck because you heard about it, because it is available in your neighborhood and not China and because there is a heated, lighted, staffed store in which to buy it.