Costs, compensations, and community building of implicit prosocial behavior in college dormitory environments: a mixed-methods study

Implicit prosocial behaviors in university dormitories, such as daily assistance, emotional support, and accommodation of others' living habits, help maintain interpersonal relationships and community functioning, yet they may carry hidden costs that erode the willingness to continue. This mixed-methods project examined the cost structure, compensation mechanisms, and community-building processes of implicit prosocial behavior in dormitory contexts across four studies. Study 1 used grounded theory with 48 interviewed students to construct a "cost-compensation-community" model. Study 2 analyzed a two-wave longitudinal survey (N = 1856, six-month interval) with random intercept cross-lagged panel modeling. Study 3 tested cost intensity and compensation type in a 2 x 3 scenario experiment (N = 320). Study 4 evaluated a 10-week relationship-balance intervention in 54 dormitories (108 students) with a three-month follow-up. Implicit prosocial behavior comprised daily assistance, emotional support, and spatial coordination; four costs emerged (time, energy, emotional, boundary), with boundary cost carrying the largest relative weight (40.7%). Within persons, T1 cost perception negatively predicted T2 sustained willingness [standardized gamma = -0.37, 95% bootstrap CI (-0.42, -0.31)], whereas the reverse path was not significant. Relational balance statistically accounted for 62.0% of the concurrent cost-willingness association. Implicit relational rewards showed a stronger indirect association than explicit recognition, and dormitory sense of community buffered the cost-willingness link (interaction beta = 0.15). The experiment showed main effects of cost and compensation, with implicit rewards producing the highest willingness. The intervention improved balance, willingness, and community sense, with gains maintained at follow-up. Findings clarify the cost-compensation dynamics of quiet everyday helping and inform dormitory community practice.