"Ivy plus" colleges — the eight Ivy League colleges along with MIT, Stanford, Duke and University of Chicago — admit children from families in the top 1% at more than twice the rate of students in any other income group with similar SAT or ACT scores, according to the new analysis from the Opportunity Insights, a group of economists at Harvard University who study inequality. Families in the top 1% of earners typically have annual income of around $611,000, the researchers said.