The article analyzes how people in the United States have changed their food buying habits over time. Researchers looked at data from surveys in 1955 and 1965 to see how income affects what people buy. They also studied how household size and where people live influence their food choices. By grouping foods together, they found out how different items affect each other's sales. The study predicts what people will eat in 1980 based on past trends and income levels.