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Power affects almost all facets of social life, from the food people eat to how long they live. Power concerns are evident in most kinds of relationships, including intimate bonds, parent–child relationships, sibling relations, and relations between group members. This brief entry examines what social psychology has learned with respect to three questions concerning power: What is power? Where does it come from? And how does power influence behavior?

What is Power?

Power is typically defined according to two attributes: (1) the ability to control one's own outcomes and those of others and (2) the freedom to act. Power is related to but not synonymous with status, authority, and dominance. Status is the outcome of a social evaluation that produces differences in respect and prominence, which contribute to an individual's power within a group. It is possible to have power without status (e.g., the corrupt politician) and status without relative power (e.g., a religious leader in line at the Department of Motor Vehicles). Authority is power that derives from institutionalized roles or arrangements. Nonetheless, power can exist in the absence of formal roles (e.g., within informal groups). Dominance is behavior that has the acquisition or demonstration of power as its goal. Yet, power can be attained without performing acts of dominance, as when leaders attain power through a cooperative and fair-minded style.

Where Does Power Come from?

Starting as early as age 2, people arrange themselves into social hierarchies. Within a day or so, young adults within groups agree with one another about who is powerful and who is not. Where does an individual's power come from? In part, individual differences matter. Thus, extraverted people—that is, those who are gregarious, energetic, and likely to express enthusiasm—often attain elevated power within natural social groups. People with superb social skills are more likely to rise in social hierarchies. And even appearance matters. People who are physically attractive, males who are taller and have large muscle mass, and even males with large, square jaws, often attain higher positions in social hierarchies.

Power also derives from facets of the interpersonal context. Authority-based roles within groups endow some individuals with power. This is true in formal hierarchies, such as the workplace, as well as in informal hierarchies, such as family structures in cultures that have historically given older siblings elevated power vis-à-vis younger siblings. Power can derive from knowledge-based expertise. Medical doctors wield power over their patients because of their specialized knowledge. Power can derive from coercion based on the ability to use force and aggression. Power can stem from the ability to provide rewards to others. This helps explain why members of elevated socioeconomic status and majority group status tend to experience greater levels of power than do people of lower socioeconomic status and minority group status. Finally, power derives from the ability to serve as a role model, which is known as reference power.

How Does Power Influence Behavior?

The English language is rich with aphorisms that concern the effects of power: “Power corrupts.” “Money [a source of power] is the root of all evil.” A recent theoretical formulation known as the approachinhibition theory of power has offered two broad hypotheses concerning the effects of power.

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