Felix Salmon is a financial journalist at Axios and the host of the Slate Money podcast. In this special holiday episode, Felix joins the show to discuss the economics of charitable giving and one of his other favorite topics, sovereign debt. David and Felix also discuss debt contract innovations, effective altruism, and ways to improve charitable giving across the U.S. and the globe.   Felix’s Twitter: @felixsalmon Felix’s website: http://www.felixsalmon.com/   Related Links:   Axios Edge newsletter: https://www.axios.com/newsletters/axios-edge Recipe for Disaster: The Formula that Killed Wall Street by Felix Salmon https://www.wired.com/2009/02/wp-quant/   David’s blog: macromarketmusings.blogspot.com David’s Twitter: @DavidBeckworth