Uber is acquiring Postmates, to gain a bigger share of the food delivery business. 

Demand for food and grocery delivery is growing amid pandemic restrictions.  Last year, research shows only 4% of grocery spending in the U.S. was online. 

But that's surged to 10-15%, according to consulting firm Bain & Company.  

And experts predict much of that growth will remain even when the pandemic is over as people experience the convenience of buying online.

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