Taxpayers in Arizona spend $125 million each school year funding more than 13,000 students who don’t exist at public schools. That’s because the state school system uses an antique budget approach that causes taxpayers to overpay, says a new report, “Ghost Busters: How to Save $125 Million a Year in Arizona’s Education Budget,” by Goldwater Institute education director Jonathan Butcher. The system pays for some students twice, Butcher says. Here’s how it happens. Arizona schools are funded based on the number of students who attend each school in the prior school year, Butcher’s report says. However, when a student transfers...