Why your behavior is rarely just your own choice

Wealth & Business · Published 18 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: In social psychology, the idea that you are an independent agent making isolated choices is a myth. Interdependence theory suggests that every interaction is a complex dance where your outcomes are dictated by a mix of situational structures, the actions of others, and the psychological weight of mutual reliance.

Developed in 1959 by Harold H. Kelley and John Thibaut, Interdependence Theory posits that interpersonal relationships are defined by how people influence one another's experiences. The formula I = ƒ[A, B, S] defines the primary logic, suggesting that every interaction (I) results from a combination of situational factors (S) alongside the specific traits and deeds of participants (A & B). This means your behavior isn't just a product of your personality; it is shaped by the 'affordances'—the possibilities—provided by the specific context you find yourself in.

The theory breaks down these interactions into four principles. The Principle of Structure identifies dimensions like 'Degree of Dependence,' which distinguishes between Actor Control (your impact on your own outcome), Partner Control (how much another person's actions dictate your success), and Joint Control (mutual reliance). It also looks at the 'Basis of Dependence,' such as promises, threats, or social norms. Crucially, it considers 'Temporal Structure,' including what Robert Axelrod called 'the shadow of the future'—the long-term strategy of cooperating now to secure reciprocal rewards later.

Beyond the structure, the theory explores how people mentally transform these situations through a cost-benefit analysis. Individuals weigh four types of resources: emotional (feelings), social (appearance), instrumental (tasks like housework), and opportunity (gains only possible through the relationship). To determine if a relationship is 'satisfying,' individuals don't just look at current rewards; they compare them against their 'Comparison Level'—an internal benchmark shaped by past experiences and observations of others. If the rewards outweigh the costs relative to that personal benchmark, the interaction is perceived as positive.

Finally, the theory highlights how people orient themselves toward others during these exchanges. Depending on their values, individuals may adopt different strategies: Cooperation (maximizing joint outcomes), Equality (minimizing differences), Altruism (maximizing the other's outcome), or Aggression (minimizing the other's outcome). By understanding these mechanisms, we can see that human connection is less about individual willpower and more about navigating a web of mutual influence.

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