Tyler Emerson talks with Geoff Ginter, a sharp advocate for single-payer health care in the U.S., and the economic lens known as modern monetary theory (MMT).Geoff became an online sensation in 2017 after a video clip went viral of his interaction with Rep. Tom MacArthur at a town hall in Willingboro, NJ, where he confronted MacArthur about his vote to repeal the Affordable Care Act.