Every society depends on relationships that allow people to cooperate beyond the limits of their individual capabilities. Families rely on trust to function, communities rely on cooperation to solve shared problems, businesses rely on confidence to exchange goods and services, and institutions rely on credibility to coordinate collective action. Although these relationships may appear ordinary, they form an essential foundation of social life. When people can depend on one another, knowledge travels more effectively, resources can be shared, and collective efforts become possible on a scale that individual action alone cannot achieve.