Research by Zhang Jun's team at Fudan University: In the food delivery battle, businesses generally experience "an increase in volume without an increase in revenue," and subsidies should be prohibited from being passed on to businesses.

On November 21, Professor Zhang Jun's research team from the School of Economics at Fudan University released a study stating that under the continuous large subsidies in the industry, the increase in revenue from the "price for volume" strategy in the food delivery business is not ideal, and it has a noticeable substitution effect on dining in, leading to a widespread phenomenon among merchants of "increased quantity but not increased revenue".