What is social loafing?
People tend to ease off when their effort is pooled. Decades of experiments show the drop is conditional, and they name the arrangements of work in which it fades.
Answer to the question
What is social loafing?
Social loafing is the tendency for people to put in less individual effort when their work is pooled into a group result than when they work alone. A meta-analysis of 78 studies found it robust but conditional: it faded where individual output could be evaluated, the task or group mattered to members, and each input was unique.
Key takeaways
- Harkins and Jackson (1985) ran four-person brainstorming groups: identifiable output produced more ideas only when members also believed their output could be compared with their co-workers'.
- Karau and Williams (1993) pooled 78 studies and found social loafing robust, with an average effect of moderate size and a wide spread across conditions.
- In that meta-analysis the difference between working alone and together largely vanished where output could be evaluated in both settings. Valued tasks, valued groups and unique inputs also showed no loafing on average.
- The collective effort model reads effort as a bet on return: people work when effort is expected to lead to a performance, an outcome and a result they value.
- Høigaard and colleagues (2006) surveyed 118 junior-league soccer players. Every cohesion and norm measure went with less perceived loafing, which was highest where social cohesion was high and task cohesion and performance norms were low.
Four-person groups brainstormed in an experiment in which each member's ideas were either counted individually or tipped into a shared total. Counting individually produced more ideas, which is the pattern social loafing predicts, but only when members also believed their counts could be set against those of their co-workers. Without that belief, counting made no difference.
People tend to put in less individual effort when their work is pooled into a single group result, and researchers call that social loafing. The drop is conditional. Across decades of experiments it appears under some arrangements of work and fades under others, so the useful question about any group task is which arrangement it has.
Colin Fisher's The Collective Edge, the seed for this piece, treats the finding as the first great caution about groups. He traces it from early rope-pulling studies through the experiments of the 1970s that gave it its name, and concludes that real synergy exists but is rare. Whether the rope data measure lost motivation or lost coordination is a separate dispute, taken up in Does Social Loafing Really Happen.
From One Experiment to Seventy-Eight Studies
In most groups two arrangements arrive bundled together: a person's output can be seen apart from the others', and it can be compared with theirs. The brainstorming experiment pulled them apart. Participants worked in four-person groups, and the design crossed the two, so that some members' ideas were identifiable and some pooled, while some believed comparison with co-workers was possible and some did not. Stephen Harkins and Jeffrey Jackson published the result in 1985 and drew from it that removing loafing takes both conditions at once.
That reading changes what identifiability means. Being countable is not enough when nobody can place the count against anyone else's. A total that sits alone in a ledger has nothing to be measured by. The study used one task and one kind of group, so it shows the logic of the two conditions and says little about how large their effect would be in an office or a classroom.
By 1993 there were enough experiments to pool. Steven Karau and Kipling Williams gathered 78 studies and reported that social loafing was robust, turning up across a wide range of tasks and populations, with an average effect of moderate size. The same paper showed that the average hid a wide spread. Evaluation potential, expectations about co-workers and how meaningful the task was all moved the size of the effect, among other variables. We take the spread as the finding. When the range runs from large effects to none, an average of moderate size describes very few real groups.
Group size is the oldest suspect in social loafing, because the early rope-pulling work had output per person falling as the pulling team grew. The meta-analysis found the relationship in the expected direction but a small one: studies that combined more individual inputs, and studies with more people performing the task, tended to report larger effects. Headcount is one input among several, and the conditions in the next section move the effect further.
Where the Effect Fades Away
Evaluation shows the clearest contrast. Social loafing was greatest in studies where a person's work could be evaluated when they worked alone but not when it was pooled. Where it could be evaluated in both settings, the difference between working alone and working together was close to nothing. That is the brainstorming result again, now across many tasks.
Three more conditions went with little or no loafing on average:
- Tasks that participants valued or found involving, whereas studies with low-value tasks showed the largest effects.
- Groups that people valued, whereas groups they valued little showed the effect; the valued cells held fewer studies than the others, which makes them suggestive rather than settled.
- Unique contributions: when each member's input was unique, people worked as hard together as alone, and with redundant inputs they did not.
Effort as a Bet, and Fisher's Design Lesson
Karau and Williams offered the collective effort model to account for this pattern. It joins expectancy-value reasoning with social identity and self-validation, and its core idea is that people put in effort when they expect it to produce a performance, expect the performance to lead to an outcome, and value that outcome. A group blurs the first links. Each person's effort disappears into a total, and the total may not be traced back to them.
Each condition in the previous section restores a link. Evaluation lets effort be traced to a person. A meaningful task or a valued group makes the outcome worth something, and a unique input makes the effort indispensable. The meta-analysis also reported the reverse of loafing in a few comparisons: on meaningful tasks, people who expected their co-workers to do poorly worked harder rather than less.
The implication, and our own view, is that social loafing describes a response to a work arrangement better than it describes a kind of person. The model gives a reason to look at the arrangement first.
Fisher's book draws a design lesson. He argues that bounded, stable, interdependent teams do better than looser arrangements, that task design is the most neglected lever, and that clear and challenging goals set at the launch matter more than chemistry built by exercises. He names brainstorming among the tasks that invite loafing, and he reports that groups beat individuals on complex knowledge work while losing on simple additive tasks.
Set beside the experiments, his advice has a plain mechanical reading. Whether a member's contribution is visible, comparable, meaningful and unique is a property of how the work was cut up and handed out, which is within the control of whoever does the cutting. Fisher writes for a general readership and the prescriptions are his; the experiments above supply the conditions that his task-design argument can lean on.
Perceived Loafing on the Soccer Pitch
A questionnaire study of 118 junior-league soccer players in Norway looked at perceived social loafing in a working team. Rune Høigaard and colleagues measured two kinds of cohesion, attraction to the team's task and bonds among members, along with three kinds of team norm, covering productivity, role commitment and mutual support. Players also rated how much social loafing they perceived in their team. Every cohesion and norm measure went with less perceived loafing. Attraction to the task, productivity norms and social-support norms predicted those perceptions best. The data are correlations and the loafing is perceived, not measured, so the study cannot say that cohesion reduced anyone's effort.
The authors also reported an interaction among task cohesion, social cohesion and performance norms. Perceived slacking was highest in teams whose players were drawn to one another but not to the task and held weak norms about performance, a combination in which friendship ran high while commitment to the shared work and expectations of one another both ran low.
Common questions
What is social loafing?
Social loafing is the tendency for people to put in less individual effort when their work is pooled into a group result than when they work alone. Research since the 1970s shows it is conditional rather than universal.
What causes social loafing?
Experiments point to arrangements in which effort cannot be traced to a person, outputs cannot be compared with co-workers', the task or the group matters little to members, or inputs are redundant. Karau and Williams's collective effort model joins these under one account of expected return on effort.
How can social loafing be reduced?
The research Karau and Williams pooled links less loafing to evaluable individual output, meaningful tasks, valued groups and unique contributions. Harkins and Jackson found that identifiable output raised idea counts only when members also believed comparison with co-workers was possible.
Sources
Fisher, C. M. (2025). The Collective Edge. New York: Avery. Seed book; vault hub Books/The Collective Edge.
Harkins, S. G., & Jackson, J. M. (1985). “The role of evaluation in eliminating social loafing.” Personality and Social Psychology Bulletin, 11(4), 457-465. doi:10.1177/0146167285114011 https://doi.org/10.1177/0146167285114011
Karau, S. J., & Williams, K. D. (1993). “Social loafing: A meta-analytic review and theoretical integration.” Journal of Personality and Social Psychology, 65(4), 681-706. doi:10.1037/0022-3514.65.4.681 https://doi.org/10.1037/0022-3514.65.4.681
Høigaard, R., Säfvenbom, R., & Tønnessen, F. E. (2006). “The relationship between group cohesion, group norms, and perceived social loafing in soccer teams.” Small Group Research, 37(3), 217-232. doi:10.1177/1046496406287311 https://doi.org/10.1177/1046496406287311