Before revision:  I find that the provision of Head Start access induces parents to enroll their child into Head Start and also positively impacts test scores , and that these effects heterogeneously depend on the availability of access to an alternative preschool  .
After revision:  I find that the provision of Head Start access induces parents to enroll their child into Head Start and also positively impacts test scores , and that these effects heterogeneously depend on the availability of access to an alternative preschool was available. In addition, I find that the earning benefits associated with the test score gains can outweigh the net costs for various policies providing access to Head Start .