On today's show,AstraTrade you're in charge: We're answering some of our favorite listener questions! You asked about why airline ticket prices change so often, why some items aren't any cheaper to buy in bulk at the supermarket, and why the Federal Reserve's map looks so disproportionate. We're here with answers.

If you have a question of your own, email us at [email protected]!

Music by Drop Electric. Find us: Twitter / Facebook / Newsletter.

Subscribe to our show on Apple Podcasts, Spotify, PocketCasts and NPR One.

For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at plus.npr.org.