Wences Casares, bitcoin evangelist and founder and CEO of Xapo, talks with EconTalk host Russ Roberts about how bitcoin works, the genius of bitcoin's creator, and how Xapo is structured to create security for bitcoin banking.

Lee Ohanian, Arnold Kling, and John Cochrane talk with EconTalk host Russ Roberts about the future of freedom, democracy, and prosperity. Recorded in front of a live audience at Stanford University's Hoover Institution as part of a conference on Magna Carta, the three guests give their perspective on the future of the American economy and the interaction between politics and economics. Each guest makes a brief presentation at the start followed by a moderated conversation.

Nobel Laureate Alvin Roth of Stanford University talks with EconTalk host Russ Roberts about his work on matching markets. Examples include marriage, matching kidney donors to kidney recipients, and students to schools in cities that allow choice in their public school systems. Roth also discusses repugnance--the unease some people have with allowing buying and selling of some goods and what it's like to watch a kidney transplant knowing your research has helped make the surgery possible.

Science writer and author Matt Ridley discusses climate change with EconTalk host Russ Roberts. Based on his reading of the scientific evidence, Ridley describes himself as a "lukewarmer." While Ridley agrees that humans have made the climate warmer, he argues that the impact is small or positive over some temperature ranges and regions. He rejects the catastrophic scenarios that some say are sufficiently likely to justify dramatic policy responses, and he reflects on the challenges of staking out an unpopular position on a contentious policy issue.

Morten Jerven of Simon Frasier University talks with EconTalk host Russ Roberts about his new book, Africa: Why Economists Get It Wrong. Jerven, who will be joining Noragric at the Norwegian University of Life Sciences this fall, argues that economists have misread the economic history of Africa, ignoring successful episodes of economic growth while trying to explain a perpetual malaise that does not exist. Jerven is critical of many of the attempts to explain growth using econometric techniques and suggests that a richer approach is necessary that is aware of the particular circumstances facing poor countries.

What's it like to hang out with Brad Pitt, Christian Bale, Ryan Gosling, and Steve Carell for two months? Adam Davidson, who writes for the New York Times Sunday Magazine, was the technical advisor to the upcoming movie, The Big Short. Besides rubbing shoulders with celebrities, he noticed what he calls the Hollywood model where highly talented workers come together temporarily in project-based employment. Davidson discusses the costs and benefits of this approach and its potential emergence as a more common phenomenon throughout the economy.

Nathaniel Popper of the New York Times and the author of Digital Gold talks with EconTalk host Russ Roberts about Bitcoin. Can Bitcoin make it? What went wrong with Mt. Gox? Why did Ross Ulbricht, the creator of Silk Road, just get sentenced to life in prison? Why are venture capital firms pouring millions of dollars into companies promising easier ways to use Bitcoin? Popper discusses these questions along with the technical side of Bitcoin to help listeners understand why so many investors are excited about the potential of Bitcoin.

Is climate change the ultimate Black Swan? Martin Weitzman of Harvard University and co-author of Climate Shock talks with EconTalk host Russ Roberts about the risks of climate change. Weitzman argues that climate change is a fat-tailed phenomenon--there is a non-trivial risk of a catastrophe. Though Weitzman concedes that our knowledge of the climate is quite incomplete, he suggests that it is prudent to take serious measures, including possibly geo-engineering, to reduce the accumulation of carbon dioxide in the atmosphere.

Bent Flyvbjerg of Oxford University speaks with EconTalk host Russ Roberts about the political economy of megaprojects--massive investments of a billion dollars or more in infrastructure or technology. Flyvbjerg argues that such projects consistently end up costing more with smaller benefits than projected and almost always end up with costs that exceed the benefits. Flyvbjerg explores the reasons for the poor predictions and poor performance of giant investment projects and what might be done to improve their effectiveness.

Did an 800-year old piece of parchment really change the world? Nicholas Vincent of the University of East Anglia talks with EconTalk host Russ Roberts about the Magna Carta, the founding document of English law and liberty. The Magna Carta was repudiated just ten weeks after King John issued it. Yet, its impact is still with us today. In this conversation, Vincent explains what led to the Magna Carta and how its influence remains with us today in England and elsewhere.