In this blog post, we’ll analyze the free-rider problem in group projects using game theory and explore effective strategies for cooperation.06

The Free-Rider Problem in Group Projects and Solutions: A Game Theory Approach

The end of the semester is just around the corner. At the end of every semester, students face not only numerous exams and reports but also a unique assignment known as “group projects.” Group projects provide students with an opportunity to practice cooperation and teamwork in preparation for the various situations they will encounter in the real world. The purpose of group projects is to ensure that, by faithfully fulfilling their respective roles to complete the assignment, students can achieve higher results than they would working alone. However, in reality, group projects are drifting far from their original objectives. While group projects emphasize cooperation among students, the “free-riding” problem frequently arises, undermining teamwork and a sense of accomplishment. This occurs because some students seek to share in the results and grades without actively contributing to the project, leading others to perceive group projects as unfair.
The original purpose of group projects is to benefit all members through mutual cooperation and to produce greater results. However, the free-rider problem obscures this ideal and causes discord within the team. The free-rider problem is serious because it goes beyond a simple lack of individual effort; it diminishes the meaning of group projects and weakens teamwork. So, is there no way to prevent free-riding in group projects? From here on, we will analyze the causes of free-riding from the perspective of game theory and explore possible solutions.

Causes and Structure of the Free-Riding Phenomenon

The fact that free-riding repeatedly occurs in group projects indicates that there are structural causes to this problem. To understand the free-riding problem, we can examine the “Prisoner’s Dilemma,” a classic case in game theory. The Prisoner’s Dilemma involves two prisoners arrested by the police who face a situation where their sentences depend on each other’s choices. The structure is such that if one trusts the other and remains silent, they receive the minimum sentence; however, if the other betrays them, it becomes more advantageous to confess. This example illustrates the fact that “cooperation is difficult when each individual prioritizes their own interests.” In reality, the free-rider problem stems from a psychological tendency to prioritize personal gain over cooperation, and similar patterns can be observed in group projects.
The free-rider problem can essentially be viewed as arising from “economic choices.” Due to the nature of group projects, where multiple people contribute together, the burden on each individual decreases, creating a greater opportunity for free-riders to emerge. Free-riders do not actively participate in the assignment, expecting that others will complete it even if they do not contribute, and thus seek to achieve results with minimal effort. While this behavior may seem advantageous to the individual in the short term, in the long run, it weakens the entire team’s willingness to cooperate and lowers the quality of the assignment.
Another cause of free-riding may be a lack of individual ability. In other words, this refers to cases where an individual lacks the ability to perform the task despite having the willingness to participate. However, since this outcome occurs regardless of the individual’s choice, it can be excluded from major considerations when discussing solutions to the free-riding problem. Instead, we need to focus on strategies to prevent the selfish choice of intentionally free-riding in group projects.

Game Theory-Based Solution: TFT Strategy

The TFT (Tit for Tat) strategy, which utilizes repeated interactions, can be effective in solving the free-riding problem in group projects. The key difference between group projects and the Prisoner’s Dilemma is that team members can observe each other’s contributions.
In iterative situations where team members can observe each other’s roles and performance, retaliation against non-cooperative behavior is possible, thereby encouraging cooperation. In fact, Professor Robert Axelrod of the University of Michigan proposed the TFT strategy as the most effective strategy in the Prisoner’s Dilemma game. This strategy involves responding identically to the opponent’s behavior—cooperating in response to cooperation and non-cooperating in response to non-cooperation.
To effectively apply this in group projects, it is important to establish stages for interaction and verification among team members throughout the project process. Since group projects typically conclude with a single final presentation or submission, the lack of repeated interaction among team members makes free-riding likely to occur. However, if multiple interim presentations and stage-by-stage evaluation processes are introduced to periodically check the project’s progress, it becomes easier to control the behavior of free-riders. For example, if a free-rider emerges during an interim presentation, the team can exclude that member’s name from the project or conduct evaluations based on individual contributions, thereby making the disadvantages of free-riding visible. This approach prevents free-riders from fully reaping the benefits, thereby reducing uncooperative behavior and contributing to a stronger willingness to cooperate within the entire team.

The Value of Cooperation and Altruism: Reflections on Free-Riding and the Good Life

In the process of solving the free-rider problem, we may ask ourselves: Why should humans cooperate and make the right choices? Humans are fundamentally self-interested beings, and in social life, they tend to prioritize their own interests. However, to prevent the overall benefit of society from diminishing when selfish choices are repeated, each individual must make the right choices within certain limits. For example, altruistic actions such as donations or volunteer work enhance social value, which in turn brings spiritual rewards and satisfaction to the individual. In other words, altruistic behavior is linked to personal happiness and ultimately enables social cooperation and coexistence.

Conclusion: Practice and Change for Making the Right Choices

The free-rider problem that arises in group projects is not merely a matter of grades but an important challenge that requires social cooperation and a sense of responsibility. To understand and resolve the essence of the free-riding problem, we proposed strategies to strengthen cooperation using game theory. To prevent free-riding in group projects, it is important to consistently verify the roles and contributions of team members through repeated interactions, ensuring that free-riding is no longer an economically rational choice. Furthermore, these experiences will provide students with valuable learning opportunities to fulfill their social roles as responsible members of society in the future.
From an economic perspective, free-riding may appear to be a short-term gain, but in the long run, it undermines individual achievement and a sense of responsibility. Therefore, group projects should not be viewed merely as assignments for academic credit, but rather as a venue for practicing cooperation and responsibility in society. The experience of enhancing not only one’s own performance but also that of the entire team through sound decision-making will serve as a valuable asset for students in their future social lives.