The Welfare Cost of Free Public Schools
估算免费公立学校的福利成本，即学校成本与家长愿意支付的最高费用之差。基于1970年加州学区数据，发现福利成本巨大，主要因为私立学校单位质量成本更低。
The welfare cost of free public schools is the difference between the cost of those schools and the maximum parents would be willing to pay to send their children to those schools. Estimates based on data from California school districts in 1970 indicate that this welfare cost is substantial, mostly because private schools are cheaper per unit of quality than public schools.