DoorDash is trying to retain customers at the higher and lower ends of the income spectrum.One of the biggest themes driving the U.S. economy and stock market right now is the idea of the "K-shaped economy." In a K-shaped economy, people at the top of the income scale get richer, while lower-income people's purchasing power declines. A widening gap, like two arms of the letter K, develops between higher- and lower-income households.As of Q2 2025, nearly 50% of U.S. retail spending came from the top 10% of e ...