"Although Amazon has been a looming threat to the grocery industry, the shadow it has cast has been pale and distant. That has now changed," he said.
Despite the naked ambition of Amazon's Jeff Bezos to launch a series of innovative products from drones to Kindles to voice ordering assistants, the takeover of Whole Foods is the company's biggest ever deal, dwarfing the $1-billion paid for online shoe retailer Zappos back in 2009.
The deal underlines the blurring between traditional and online retail and just how closely Amazon is watching its biggest rival, China's Alibaba, which recently said its "new retail" strategy will mean that shoppers can touch and test products in the shop then order them to arrive at their homes before they return from shopping.