Rich and young Americans will lead consumers into an increasingly broad adoption of online grocery shopping, which U.S. supermarkets must quickly adapt to, according to a major new survey given to the International Business Times.

Wealthy shoppers and Millennials together represent a fifth of all grocery shoppers, and are the two most likely groups to shop online, according to the report by leading retail consultancy Brick Meets Click, which is coming out in early October.

High earners seek rare natural, organic and artisanal products, and will buy them online to save time. Millennials are already used to online shopping for everything else, but will be more sensitive to added delivery costs.

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