The New York Times, December 12, 2016: It Turns Out Spending More Probably Does Improve Education

"The problem with that perspective was the answer could be ‘yes,’ even if funding was too low across the board. Starting with a 1990 court case in Kentucky, courts started asking about ‘adequacy’ instead. Were school districts getting enough money, which might require giving extra money to districts that enroll many low-income, expensive-to-serve students?"