This paper uses micro-level data on social networks in middle and secondary schools to estimate effects of connectedness on education attainment outcomes. The analysis addresses concerns about unobserved neighborhood and school-level heterogeneity by using within-school variation between grade cohorts to identify effects of connectedness. Main findings include that being part of a more connected cohort within a given secondary or middle school is associated with significantly higher years of schooling attained and higher probability of having attended college, 7 years later.

College GPAs in the United States rose substantially between the 1960’s and the 2000’s. Over the same period, study time declined by almost a half. This paper uses a 12-quarter panel of course evaluations from the University of California, San Diego to discern whether a link between grades and effort investment holds up in a micro setting. Results indicate that average study time would be about 50% lower in a class in which the average expected grade was an “A” than in the same course taught by the same instructor in which students expected a “C.” Simultaneity suggests estimates are biased toward zero. Findings do not appear to be driven primarily by the individual student’s expected grade, but by the average expected grade of others in the class. Class-specific characteristics that generate low expected grades appear to produce higher effort choices—evidence that nominal changes in grades may lead to real changes in effort investment.

In 1961, the average full-time student at a 4-year college in the U.S. studied about 24 hours per week, while his modern counterpart puts in only 14 hours a week. Students now study less than half as much as universities claim to require. This dramatic decline in study times occurred for students from all demographic subgroups, overall and within every major, for students who worked and those who did not, and at 4-year colleges of every type, degree structure and level of selectivity. Most of the decline predates the innovations in technology that would be most relevant to education production, and thus was not driven by such changes. The most plausible explanation for these findings, we conclude, is that standards have fallen at post-secondary institutions in the United States.

Using multiple datasets from different time periods, we document declines in academic time investment by full-time college students in the United States between 1961 and 2003. Full-time students allocated 40 hours per week toward class and studying in 1961, whereas by 2003 they were investing about 27 hours per week. Declines were extremely broad-based, and are not easily accounted for by framing effects, work or major choices, or compositional changes in students or schools. We conclude that there have been substantial changes over time in the quantity or manner of human capital production on college campuses.