User Interface Design & Consumer Behavior - The industry needs more adversarial UI design that works in the user's interest [1] - The industry should consider operating system plugins that override ride/delivery app UIs to show all-inclusive total prices, including tax, fees, and expected tip [1] - Delivery app tipping is a tool for maximizing price paid by consumers, not a feedback mechanism [1] - Consumers are economically irrational with tips; for every $1 in tip, they behave as if it were $0.80 [1]