Robinhood has announced 24-hour trading on some stocks and ETFs on weekdays, becoming the first brokerage to offer customers the feature. CEO Vlad Tenev discusses the evolution of the trading “day,” as well as the volume of retail traders and money inflows, amid economic volatility. CPI and PPI data this week have indicated that inflation might be slowing down–finally. Richmond Federal Reserve President Tom Barkin is unconvinced, however; he maintains that inflation is still moving too slowly toward the Fed’s 2% target. Treasury Secretary Janet Yellen is warning CEOs and politicians about the risk of America defaulting on its debt. Plus CNBC’s Robert Frank reports on the $2B worth of art going on sale at auction this week. In this episode:Vlad Tenev, @vladtenevRobert Frank, @robtfrankJoe Kernen, @JoeSquawkBecky Quick, @BeckyQuickCameron Costa, @CameronCostaNY