Uber and DoorDash bet on higher earners. It's paying off big.

High-income consumers buoyed quarterly results at Uber, DoorDash, and Instacart.

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• Uber, DoorDash, and Instacart targeted high-income consumers — and boosted their quarterly earnings.
• Their latest offerings, from hotel booking to coffees in an Uber Black, take aim at affluent users.
• The companies are still maintaining offerings for customers looking to save money.

Black-car rides, paid memberships, and other offerings for affluent consumers are paying off for Uber...