Ultimately, revenue is just a means to profit which is the true value. Apple can squeeze much more profit out of every dollar of revenue than Walmart ever could.
Grocery shops have very low margins, you just buy a good, put it on a shelf, sell it. Not much premium you can ask off of that because any Ahmad down the street can provide the same service.
Apple on the other hand has their own product and a cult brand as cherry on top, their margins are way higher.
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