Around the world, health care is seen as a responsibility of nations. But in the 21st century, is a national system or a national government the best way to guarantee and provide coverage? At a Zócalo/Arizona State University event in Phoenix moderated by ASU President Michael Crow, Dr. Denis A. Cortese, emeritus president and CEO of the Mayo Clinic, and Sir Malcolm Grant, chairman of NHS England, discuss the best models for creating a healthier world.