JEFF BEZOS does not like sitting still. In his annual letter to Amazon’s shareholders this year, he warned of “stasis. Followed by irrelevance. Followed by excruciating, painful decline. Followed by death.” Competitors are toiling to avoid the same fate but it is hard to keep up. On June 16th Amazon said it would pay $13.7bn for Whole Foods, an upscale grocer known for its organic produce.