Concerns about excessive mobile phone use among youth are mounting. We present estimates of behavioral and contextual peer effects, along with comprehensive evidence on how students’ own and their peers’ app usage affect academic performance, physical health, and labor market outcomes. Our analysis draws on administrative data from a Chinese university covering three student cohorts over four years. We exploit random roommate assignments, differential exposure to a policy shock (gaming restrictions for minors), and differential exposure to a discrete event (the introduction of a blockbuster video game) for identification. App usage is contagious: a one s.d. increase in roommates’ in-college app usage raises own usage by 5.8%. High app usage is harmful across all measured outcomes. A one s.d. increase in app usage reduces GPAs by 36.2% of a within-cohort-major s.d. and lowers wages by 2.3%. Roommates’ app usage reduces a student’s GPA and wages through both disruptions and behavioral spillovers, generating a total negative effect that exceeds half the magnitude of the impact from the student’s own app usage. Extending China’s three-hour-per-week gaming restriction for minors to college students would boost their initial wages by 0.9%. High-frequency GPS and app usage data show that heavy app users spend less time in study halls, are more frequently late or absent from class, and get less sleep.

The third challenge stems from the well-known difficulties in identifying peer effects in empirical settings, including the endogeneity of peer group formation and the “reflection problem” first articulated by Manski (1993)—an individual’s behavior both affects and is affected by their peers, making it difficult to establish causality. Disentangling the two classical types of peer effects, behavioral (endogenous) and contextual (exogenous) peer effects, is even more challenging (Manski 1993; Bramoullé, Djebbari, and Fortin 2020). In our context, the behavioral peer effects refer to how roommates’ action of app playing influences a student’s own app usage. Contextual peer effects, by contrast, capture how peers’ predetermined characteristics influence a student’s outcomes independent of their actual behaviors. In our setting, the key regressor capturing contextual peer effects is roommates’ precollege game usage, which may reflect traits such as motivation, attitudes toward academics, or established study habits.

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Lysol Disinfecting Wipes - Lemon/Crisp Linen/Mango and Hibiscus - 80ct

Lysol Disinfecting Wipes - Lemon/Crisp Linen/Mango and Hibiscus - 80ct

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Lysol Disinfecting Wipes can be used as a convenient way to clean and disinfect your household surfaces. Each pre-moistened disposable disinfecting wipe kills 99.9% of germs when used as directed. No bottles, no sponges, no mess. Lysol Disinfecting Wipes are great for cleaning most surfaces and disinfecting surfaces. These Lysol Wipes kills 99.99% of all viruses and bacteria, including the following: Cold and Flu Viruses, Salmonella Enterica (Salmonella), Influenza A Virus, Herpes Simplex Virus Type 1, Respiratory Syncytial Virus, and COVID-19 when used as directed on hard, non porous surfaces. Each cleaning disinfecting wipe kills cold and flu viruses and helps stop the spread of germs, perfect for touch-up cleaning. Lysol Wipes are also approved to remove more than 95% of allergens. Like germs, allergens exist on hard surfaces. Use Lysol wipes as directed. These disinfecting wipes are even suitable to use on wood. How to Use Lysol Disinfecting Wipes? Pre-clean surface. Use enough fresh disinfectant wipe to thoroughly wet the surface. To Sanitize with these cleaning wipes: Allow to remain wet for 10 seconds. To disinfect with these cleaning wipes: Allow to wet for 4 minutes. To clean and remove allergens with these cleaning wipes: Use fresh wipe on surface. For surfaces that come in contact with food, rinse thoroughly with water. Repeat for stubborn stains. For more than a century, Lysol has been helping to protect families from illness-causing germs.

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