This week’s podcast is another installment of “FREAK-quently Asked Questions,” in which Levitt and Dubner field queries from readers and listeners. (You can download/subscribe at iTunes, get the RSS feed, or listen via the media player in the post. You can also read the transcript below; it includes credits for the music you’ll hear in the episode.)

They talk about their most embarrassing mistakes, whether ladies’-night discounts constitute unfair price discrimination, and how to drive like an economist.

Plus, Levitt remembers his late sister, Linda, who came up with the title for Freakonomics. In a conversation a few years ago, she explained: