Money Talks: Pricing pollution Could the success of the world’s biggest carbon market provide a model for the world? Plus, Cristina Junqueira, founder of Nubank a Brazilian digital bank, on how the pandemic is supercharging the fintech revolution. And, why sports cards’ leap from the schoolyard to the stock exchange reveals the growing financial power of social networks.  Please subscribe to The Economist for full access to print, digital and audio editions: www.economist.com/podcastoffer   See acast.com/privacy for privacy and opt-out information.