Studies show that school choice voucher programs save states money. Arizona’s Empowerment Scholarship Account program, in particular, is expected to save the state about $500 million in education expenses this year while costing only $377 million. Statewide public school enrollment has declined by 31,000 since the ESA program began and is currently 70,000 below budget projections, as Corey DeAngelis and Jason Bedrick pointed out the other day in the Wall Street Journal.