Following a precedent is easier than keeping track of turns
A team of MIT researchers has confirmed through careful experiment what social intuition has long whispered: the expectation of taking turns in generosity is not a universal human instinct, but a rule reserved for those who meet as equals. When hierarchy enters a relationship, people stop counting turns and start following scripts — repeating whatever pattern has already been established. The finding, published in Open Mind, invites us to reconsider how much of our social life is governed not by fairness, but by the quiet gravity of precedent.
- The assumption that reciprocity is humanity's default social strategy has been experimentally overturned — it applies only between equals or strangers, not in the hierarchical relationships that dominate daily life.
- In asymmetric relationships, the cognitive burden of tracking turns gives way to a simpler mechanism: once a pattern is set, people expect it to simply repeat, regardless of fairness.
- This precedent-following isn't a social failure — researchers argue it actively reinforces the structure of relationships, signaling roles and expectations in ways that sustain bonds over time.
- MIT's Rebecca Saxe and Alicia Chen are now building computational models to map which factors — status, benefit, relationship type, cultural context — most powerfully shape when and whether people expect generosity to be returned.
When a friend buys you coffee, you buy the next round. This exchange feels like the natural order of things — but MIT researchers have now shown experimentally that tit-for-tat generosity only holds between equals. The moment status enters the room, the rules change entirely.
Cognitive scientist Rebecca Saxe and graduate student Alicia Chen designed experiments using realistic everyday scenarios — coffee, meals, concert tickets — varying only the relationships involved. When participants read about peers or coworkers of equal rank, they expected generosity to flow back and forth. But when one person held more power or status, expectations flipped: people assumed whatever pattern had been established would simply continue. An older sibling who bought concert tickets was expected to keep buying them.
The researchers explain this through cognitive efficiency. Tracking turns requires active mental effort; following precedent requires almost none. In hierarchical relationships, which make up much of human life, this shortcut becomes the default. Saxe frames it not as a failure of fairness but as a feature — these repeating patterns reinforce the structure of the relationship itself, signaling roles and building bonds in the way anthropologists have long understood gift-giving to do.
The study, published in Open Mind, challenges behavioral economics' long-held assumption that reciprocity is humanity's baseline social strategy. It is — but only among equals. Saxe and Chen are now developing computational models to quantify which factors most influence generosity expectations across different contexts, moving toward a fuller picture of how we navigate the hierarchies and bonds that shape real life.
When a friend buys you coffee, you buy the next round. This simple exchange—generosity met with generosity—feels like the natural order of human interaction. But researchers at MIT have now shown experimentally what anthropologists have long suspected: this tit-for-tat generosity only works when the people involved see themselves as equals. The moment status enters the room, everything changes.
Rebecca Saxe, a cognitive scientist at MIT, and her graduate student Alicia Chen designed a series of experiments to test how people actually expect generosity to work in different kinds of relationships. Rather than the typical economics lab setup—strangers playing abstract games—they asked participants to read realistic stories about everyday exchanges: one person buying coffee for another, someone preparing a meal, tickets being purchased for a concert. The twist was that the researchers varied the relationships described in these stories. Sometimes the people involved were peers. Sometimes one had clear authority or status over the other.
What emerged from the data was striking in its consistency. When people read about symmetric relationships—friends, cousins, coworkers of equal rank—they expected generosity to flow back and forth. If one person gave, the other would give in return. But when the relationship was asymmetric, with one person holding more power or status, people's expectations flipped entirely. They no longer anticipated reciprocity. Instead, they expected whatever pattern had been established to simply continue. If an older sibling bought concert tickets for a younger one, participants assumed the older sibling would keep buying the tickets. If a professor always bought coffee for students, that was the expected pattern going forward.
The researchers offer an explanation rooted in cognitive efficiency. Maintaining reciprocity—keeping track of whose turn it is, ensuring equal exchange—requires mental work. It's a system you have to actively manage. But following precedent requires almost nothing. Once a pattern is set, you just repeat it. In hierarchical relationships, which make up a significant portion of human interaction, this cognitive shortcut becomes the default. You don't have to remember who did what last time. You already know what comes next.
Saxe frames this not as a failure of fairness but as a feature of how relationships actually work. "In many intimate relationships, hierarchical relationships, or other kinds of role-based relationships, you don't put in the work of trying to keep track of turns," she explains. Following precedent, she suggests, may actually serve a deeper function: it helps solidify and maintain the relationship itself. Anthropologists have long understood that gift-giving constructs social bonds. When a professor consistently buys coffee for students, or a manager takes a junior employee to lunch, these patterns reinforce the structure of the relationship. They signal what each person's role is and what can be expected.
The study, published in the journal Open Mind, challenges a common assumption in behavioral economics—that reciprocity and turn-taking are humanity's default social strategies. They are, the research suggests, but only among equals or strangers. In the relationships that actually dominate our lives, we operate by different rules entirely. We follow the script that's already been written.
Saxe and Chen are now building computational models to test which factors matter most when people decide whether someone will reciprocate a generous act. Beyond social status, they're examining how much each person benefits from an exchange, what type of relationship they're in, and how cultural expectations shape behavior. The goal is to quantify, across different contexts and relationships, which considerations actually drive human decision-making about generosity. It's an attempt to move beyond the laboratory and toward a more complete picture of how we navigate the intricate hierarchies and bonds that structure real life.
Citas Notables
In many intimate relationships, hierarchical relationships, or other kinds of role-based relationships, you don't put in the work of trying to keep track of turns. We just follow precedent because following a precedent is easier.— Rebecca Saxe, MIT cognitive scientist
When people know the relationship is asymmetric, they don't expect reciprocity; they expect the same action to keep on going.— Alicia Chen, MIT graduate student
La Conversación del Hearth Otra perspectiva de la historia
So the finding is basically that we don't keep score in unequal relationships. We just... follow what happened before.
Right. And it turns out that's not laziness or unfairness—it's actually how we maintain those relationships. The pattern itself becomes part of what the relationship is.
But doesn't that lock people into roles? If a junior employee always helps the boss move, doesn't that just entrench the hierarchy?
It can. But the researchers aren't saying it's good or bad. They're saying it's what people expect and predict. The hierarchy was already there. The generosity pattern just reflects it.
What about relationships that start unequal but become equal? Like a mentor and student who become peers?
That's the interesting part they haven't fully explored yet. The computational models they're building might help answer that. How do people recalibrate when the relationship itself changes?
So reciprocity isn't universal. It's conditional on equality.
Exactly. And most of our relationships aren't equal. So most of our relationships don't operate on reciprocity at all. We're following precedent instead.