How does the chapter define a community in contrast to aggregates and populations?

The chapter defines a community as a group of individuals living in the same geographical area or sharing a common denominator, such as ethnicity or religion, who recognize their membership through social interaction, ties to other members, and often collective decision making. In contrast, aggregates and populations are larger groups who share at least one characteristic, such as age or a health issue, but whose members may not interact with one another or recognize themselves as part of the group. The text notes that the terms aggregate and population are frequently used interchangeably.

The chapter's contrast relies on social recognition and interaction. A community is not merely a demographic cluster; members have social bonds, recognize their membership, and often engage in joint decision making. Populations, on the other hand, are defined by shared traits such as age, gender, ethnicity, residence, or a common health issue, without requiring interaction or self-identification. Because the text states that aggregate and population are often used interchangeably, aggregates similarly represent groups sharing characteristics rather than necessarily having community ties. Thus, the key distinction is that community members are socially connected and see themselves as part of a collective, whereas aggregate or population members need not interact or feel any shared identity.