This article proposes an indirect method to validate existing estimates of immigrants? stock from the Spanish municipal population register, which some believe might be over-counting immigrants who double register in different municipalities or fail to deregister when leaving the country. The...

The Affordable Care Act (ACA) allows state variation in implementing health reform. Critical to a stable health insurance market under reform is the use of risk adjustment to share risks across insurance plans. The ACA requires states to implement risk adjustment, but a California-specific risk...