Wal-mart vs Amazon in Online Groceries

In Knowledge @ Wharton:  Very good piece on which of these retail giants are ahead in online retail, and the implications for their future.    " ... Retail behemoths Walmart and Amazon are both readying major efforts to gain dominance in the online grocery business, which currently accounts for less than 1% of sales in a $568 billion market. Earlier in June at Walmart’s annual meeting, CEO Mike Duke said the company is investing in logistics infrastructure for online sales. The same week, Reuters reported that Amazon is planning “a major roll-out of an online grocery business that it has been quietly developing for years.” ... '   Walmart and Amazon are about to grapple for dominance in the burgeoning online sector of the $568 billion U.S. grocery business. Wharton experts analyze the strengths and weaknesses of each company -- and identify a dark horse that could give both a run for their money.... '