This document discusses household structures and consumption behaviors. It begins by defining different household types such as family households and non-family households. It then describes the household life cycle model and the different stages households typically go through, such as young singles, young married couples with and without children, middle-aged singles and couples with children at home or empty nests, and older singles and couples. Each life cycle stage is associated with unique consumption needs and purchasing behaviors. The document provides details about characteristics and expenditures for each life cycle stage.