In this bonus middle-of-the-week podcast, Henry Aaron of the Brookings Institution talks with EconTalk host Russ Roberts about health care costs. Researchers in a New England Journal of Medicine article have estimated that the US could save $209 billion if the US went to a single-payer system like Canada. Is this number reliable? Aaron takes a deeper look at the estimate and discusses the relevance of such estimates for health care policy. This is a special mid-week podcast. It's a follow-up to an earlier podcast with Arnold Kling that raised the issue of administrative costs and potential savings from going to a single-payer system. It also ties in with recent discussions here at EconTalk about the challenges of accurate measurement in the social sciences. We hope you enjoy it. If not, come back Monday when our regular schedule resumes.