A Signaling Theory of Grade Inflation*

When employers cannot tell whether a school truly has many good students or just gives easy grades, a school has incentives to inflate grades to help its mediocre students, despite concerns about preserving the value of good grades for its good students. We construct a signaling model where grades are inflated in equilibrium. The inability to commit to an honest grading policy reduces the efficiency of job assignment and hurts a school. Grade inflation by one school makes it easier for another school to do likewise, thus providing a channel to make grade exaggeration contagious.