While the retailer’s same-day delivery expansion leverages its enormous reach online, its fractional brick-and-mortar presence remains a central liability, industry analysts said.

Amazon is expanding its same-day grocery delivery service to 1,000 cities and towns across the U.S., the company said Wednesday. It's also introducing thousands of perishable grocery items to its offerings,

Amazon is now rolling out a service where its Prime members can order their blueberries and milk at the same time as their batteries and other basic items.