The trading app brought retail investing to the public—now it is going public via its retail investors. Our Wall Street correspondent reports from inside its unusual IPO. Plus, as food prices soar, big agriculture is having a bumper year. How long can it last? And lessons from the history books for a new age of central banking. Patrick Lane hosts  Subscribers to The Economist can join John O’Sullivan, Buttonwood columnist, and Alice Fulwood, Wall Street correspondent, on July 29th for a live event unpicking the inner workings of financial markets and how to make sense of them. Register and submit your questions at economist.com/marketsevent For full access to print, digital and audio editions as well as exclusive live events, subscribe to The Economist at economist.com/podcastoffer   See acast.com/privacy for privacy and opt-out information.