Amazon.com Inc. officially closed its deal to buy Whole Foods for $13.7 billion dollars this week, effectively making its first really substantial entry into bricks-and-mortar retailing. In closing the deal, Amazon confirmed theories that industry watchers had been batting around since Amazon announced its plans to by Whole Foods back in June. In this episode, Katie Evans, Internet Retailer’s technology editor, talks about the moves Amazon is beginning to make in grocery and what it means for retailing.