Consider the degree not as education, but as a signalling device. If you admit #10, then they will beat out #7-#9 in the job market, increasing lifetime earnin

Consider the degree not as education, but as a signalling device. If you admit #10, then they will beat out #7-#9 in the job market, increasing lifetime earnings at the expense of the others. If you don't admit #10, then #6-#10 will compete on an equal footing. The latter may be the outcome you want.