Grocery shopping is a giant prize–accounting for around $800bn of spending a year in America. But it is also a notoriously tough business, with price-sensitive customers keeping a tight lid on margins. Add in online delivery and it often becomes unprofitable. Convincing customers to buy more of their groceries online is the holy grail for a digital-native company like Amazon, which is a newcomer to the business. But Amazon’s “technology first” approach hasn’t been enough to win over the market, or the customers who still see the value of shopping in-store. This leaves grocery stalwarts like Walmart with an opportunity–to expand online, while utilising their foothold in brick-and-mortar stores. With margins so tight, yet the lure of convenience strong, what is the future for online grocery shopping?

On this week’s podcast, hosts Tom Lee-Devlin, Alice Fulwood, and Mike Bird examine how the grocery business is adapting to the digital age. Bill Aull, leader in the North America Retail and Consumer Practice at Mckinsey, explains how online grocery shopping has struggled to make a mark in the US. And Jason Del Rey, author of "Winner Sells All", lays out what the battle between Amazon and Walmart tells us about the future direction of the industry.

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