Why Amazon is driving force behind Asda-Sainsbury's merger

Proposed merger seen as an attempt to insulate against Amazon’s move into sectorThe rapid expansion of discounters Aldi and Lidl – whose share of the grocery market has rocketed from less than 4% a decade ago to nearly 13% today – has hit all traditional supermarkets. But the industry’s biggest fear is Amazon.Sainsbury’s boss Mike Coupe has long made clear that his real concern is the online giant, which is now the world’s second biggest company, valued at $74