“In effect, the study shows, these policies amounted to affirmative action for the children of the 1 percent, whose parents earn more than $611,000 a year.”

Aatish Bhatia, Claire Cain Miller and Josh Katz:

Elite colleges have long been filled with the children of the richest families: At Ivy League schools, one in six students has parents in the top 1 percent.

A large new study, released Monday, shows that it has not been because these children had more impressive grades on average or took harder classes. They tended to have higher SAT scores and finely honed résumés, and applied at a higher rate — but they were overrepresented even after accounting for those things. For applicants with the same SAT or ACT score, children from families in the top 1 percent were 34 percent more likely to be admitted than the average applicant, and those from the top 0.1 percent were more than twice as likely to get in.

The study — by Opportunity Insights, a group of economists based at Harvard who study inequality — quantifies for the first time the extent to which being very rich is its own qualification in selective college admissions.

The analysis is based on federal records of college attendance and parental income taxes for nearly all college students from 1999 to 2015, and standardized test scores from 2001 to 2015. It focuses on the eight Ivy League universities, as well as Stanford, Duke, M.I.T. and the University of Chicago. It adds an extraordinary new data set: the detailed, anonymized internal admissions assessments of at least three of the 12 colleges, covering half a million applicants. (The researchers did not name the colleges that shared data or specify how many did because they promised them anonymity.)

The new data shows that among students with the same test scores, the colleges gave preference to the children of alumni and to recruited athletes, and gave children from private schools higher nonacademic ratings. The result is the clearest picture yet of how America’s elite colleges perpetuate the intergenerational transfer of wealth and opportunity.