This Planet Money Indicator episode answers three listener questions: Why are bananas so cheap? What would a 20% flat federal income tax rate mean? And why does after-hours stock trading exist? The episode uses expert opinions to explain the factors contributing to banana price stability (high yield, low perishability), the potential impacts of a flat tax (increased revenue from the wealthy, but higher taxes for low-income earners), and the risks and reasons behind after-hours stock trading (lower liquidity, higher volatility). Listeners gain a better understanding of these economic concepts through concrete examples and expert analysis.