I'm not saying they can do it on every or most items, I'm saying there are many items they can. They make large profits on some items, and lose large amounts o

I'm not saying they can do it on every or most items, I'm saying there are many items they can. They make large profits on some items, and lose large amounts on other items to keep customers coming back. If they stopped selling losing items (part of the reason they closed quidsi), they'd grow slower but make more. I can't find Walmart profit numbers for just the online part, or even revenue, but estimates I found say that Amazon is selling more than ten times as much than Walmart. (See http://www.cnbc.com/2016/12/23/amazon-grabbing-the-bulk-of-surging-online-sales-this-holiday.html http://www.cnbc.com/2016/12/23/amazon-grabbing-the-bulk-of-s...). Unless Walmart's margins are ten times better, Amazon made more from online.