Do Economic Illiterates Understand That Wal-Mart's Profit Margin of 3.3 % Is Lower Than Apple's at 21.6% ?

The Economist has some data your typical illiterate progressive doesn't understand or want to understand. When you hear Wal-Mart is paying low wages: check out their profit margin of 3.3% vs. Apple's profit margin of 21.6%. Why don't the progressives demonstrate against Apple? Why don't progressives demand unions at Apple stores? Why do we constantly hear Wal-Mart mistreats its' workers? Why do we need New York city politicians preventing us from low prices at Wal-Mart by restraining trade through zoning?