Written by: Madeline Sesti
The majority of people, at one point in their lives, have faced the classic question: Who forgot to replace the roll of toilet paper? Much like public goods, the toilet paper in a shared bathroom illustrates the tension between collective benefit and individual responsibility, where everyone relies on it, but no one wants to be the one to replace it. In economics, public goods are defined as being both non-excludable and non-rivalrous, meaning that everyone benefits and one person’s use does not reduce their availability, unless there is congestion. In roommate settings, many responsibilities and resources function as public goods. Shared living arrangements highlight the free rider problem and the Prisoner’s Dilemma, as roommates benefit from common goods like utilities or cleanliness, but have incentives to evade their responsibilities, ultimately leading to suboptimal outcomes overall. This tension mirrors broader economic inefficiencies and raises ethical questions about fairness and cooperation, particularly in the context of roommates, a situation that is especially relevant given that nearly 80 million adults lived in a shared household arrangement in 2017 (Pew Research Center, 2018).
As mentioned, the key components of public goods are that they are both non-rival and non-excludable. However, the non-excludability of these goods presents a dilemma: the free rider problem. The free rider problem arises when individuals who refuse to pay for or maintain a public good cannot be prevented from using it. This can lead to market failure as each person has an incentive to under-contribute, in hopes that others will provide the good for them, which can result in socially undesirable outcomes. With roommates, it is rational to avoid the most unpleasant tasks, such as cleaning the bathroom or taking out the trash. In the short-term, this is reasonable on an individual level—it is easy to pile on one more piece of trash with the assumption that your roommate will take it out. However, collectively, this type of behavior is inefficient and will ultimately lead to worse outcomes for everyone. These unpleasant tasks are clear examples of the free rider problem, where individuals benefit from shared cleanliness without contributing their fair share of effort.
Numerous applications of roommate life demonstrate how the inefficiency of free-riding can cause a small issue which can escalate into larger conflicts. In cleaning shared spaces, everyone enjoys the benefits of a clean house, but each individual prefers that others do the work, leading to under-provision, or a messy space. The same logic applies to household goods such as trash bags or dish soap. These are non-excludable once purchased, if one person buys them, the entire household benefits without any additional contribution. Similarly, when one roommate buys a couch or TV for the living room, the goods are shared and others enjoy them at no cost.
The rationality of free-riding can be explained through a strategy game, known as the Prisoner’s Dilemma, where individual behaviors lead to poor collective outcomes. For example, suppose two roommates share a sink full of dirty dishes. Washing the dishes requires time and effort, while the consequence of leaving them unwashed is only a minor smell. Each roommate has an incentive to wait for the other to do the dishes, thereby attempting to avoid doing it themselves. However, if neither washes the dishes, the sink will remain dirty, leaving both worse off in the long run. This framework is widely applicable to public goods but limited by the assumption that players act as perfectly rational agents, homo economicus rather than homo sapiens.
Although the Prisoner’s Dilemma illustrates the pervasiveness of the free rider problem in households, its assumption of humans as rational, selfish agents does not fully capture the behavioral and ethical considerations inherent in human nature. Although there may be an incentive to wait until a roommate does the dishes for the benefit of the group, we do not always observe that outcome. Ethically, it is unfair for one person to bear greater costs while the others benefit, especially if the issue persists. Free-riding can create resentment and undermine trust among roommates. Research on peer-peer cultural value mismatch supports this dynamic, showing that “reciprocation mismatch,” when one roommate contributes to shared duties but does not receive equal effort in return, can increase psychological distress and even harm academic outcomes. These findings highlight how a failure to cooperate can have tangible consequences, creating an inherent incentive to collaborate even when economic rationality suggests otherwise (Vasquez-Salgado et al., 2023). From an ethical standpoint, one could argue that cooperation in chores and costs is a duty. Even if avoiding responsibility is rational in an economic sense, prescriptive theory suggests that everyone should contribute equally to the common good.
Social forces such as equality or altruism can sometimes resolve this issue. For example, if one roommate buys hand soap several times, others may begin to feel inclined to reciprocate. Here, social norms and ethics play a corrective role in a situation where economic rationality alone creates inefficiency. Other solutions emerge through the deliberate design of mechanisms to reduce free-riding. For instance, a chore schedule or an agreement to split the costs of shared goods would prevent the burden from being on one person. Although in other cases, social pressure alone, such as the fear of being labeled a “bad roommate” can be enough to avoid these issues. These strategies function like institutions in a broader sense, which provide incentives that cause one’s behavior to align with improved group welfare.
In conclusion, the problems that arise out of roommate dynamics encapsulate the principles of the larger public goods problem. Household supplies, cleanliness, and other shared responsibilities are both non-excludable and non-rivalrous, making them susceptible to free-riding. While evading responsibilities may be rational on an individual level, the combined result is conflict and inefficiency. This small-scale situation mirrors broader societal challenges, such as reducing pollution or funding public goods. Ultimately, the free rider problem highlights the tension between economic rationality and moral responsibility. Whether in a household or a giant corporation, solving this problem requires a combination of ethical code, and incentivized cooperation to achieve outcomes that are both efficient and fair.
References
Family Cleaning Together [Photograph]. Stock Cake. https://stockcake.com/i/family-cleaning-together_1295798_964431
Fry, Richard. (2018, January 31). More adults now share their living space, driven in part by parents living with their adult children. Pew Research Center, https://www.pewresearch.org/short-reads/2018/01/31/more-adults-now-share-their-living-space-driven-in-part-by-parents-living-with-their-adult-children/
Vasquez-Salgado, Y., Greenfield, P. M., Guan, S. A., Gonzalez, L., & Tarlow, D. A. (2023). Peer-Peer Cultural Value Mismatch in the Dormitory During the Transition to College: Antecedents and Correlates. Journal of Intercultural Communication & Interactions Research, 2(1), 37–74. https://doi.org/10.3726/jicir.2022.1.0004