> Amazon basically bought the country’s sixth-largest grocery store for free. For the curios, the five bigger seem to be, in descending order: Kroger, Albertsons, Ahold USA, Publix, and H-E-B Grocery. (Walmart is #7). Ahold owns Giant, Martin's, Stop & Shop.
where did the walmart number come from? By several sources, they are the largest grocery retailer in the US. In 2012, this article puts grocery revenue at $255b (over twice krogers revenue): http://money.cnn.com/2013/01/31/news/companies/walmart-groce... And this article says they have 25% of the 700b grocery market: http://www.salon.com/2013/03/28/will_wal_mart_replace_the_su... And this article says "Wal-Mart's big…
Different sources give different rankings, often very different. I picked that one because it was the only one I found at the time that put Whole Foods at #6, so at least might be the ordering the article author was thinking of.
It's also not clear how largeness should be measured. Some lists seem to be by sales. Some seem to be by number of stores. Some seem to be by number of employees. It's not always clear which a given list is using.