Teachers who hand out easy A's aren't doing their students any favors. A new National Bureau of Economic Research study finds that grade inflation reduces the lifetime earnings of students by more than $200,000.
The research, conducted by economists Denning, Nesbit, Pope, and Warnick, quantifies what many employers have long suspected. A teacher with one standard deviation higher average grade inflation reduces "the present discounted value of lifetime earnings of their students by $213,872 per year."
That's not a typo. Easy grading costs students the equivalent of a house.
The mechanism is straightforward but damning. Grade-inflating teachers demonstrate "moderately lower cognitive value-added," meaning they're less effective at improving actual student learning. Students get higher marks on report cards but lower scores on standardized tests. They're more likely to drop out of high school. Fewer enroll in college. Those who do attend earn less over their careers.
The disconnect between artificial grades and real skills creates a delayed reckoning. Students think they're performing well based on their transcripts. Employers and universities discover otherwise through testing, interviews, and actual job performance. The market eventually prices in the truth.
The study distinguishes between two types of inflation. "Average grade inflation" across all students shows the strongest negative effects on long-term outcomes. "Passing grade inflation" that helps struggling students clear minimum thresholds has more limited impact and can actually reduce dropout rates.
From an employer's perspective, the findings validate increased reliance on skills testing rather than academic credentials. If grades have become unreliable signals of competence, companies must invest more in assessment. That creates friction and costs in hiring processes.
The research also illuminates why credential inflation has accelerated. As undergraduate degrees become less meaningful markers of ability, employers demand graduate degrees for positions that previously required only bachelor's credentials. Students respond by pursuing additional expensive education, deepening debt burdens without commensurate skill gains.
