Today on The Gist, Adam Davidson from Planet Money explains why dollar stores are way less evil than Wal-Mart. Plus, Slate’s Emily Yoffe joins us for a Post-Prudence Impact Statement with past letter writer Swinger Ex-Boyfriend. And in the Spiel, Ira Glass dances his way into our hearts. Get The Gist by email as soon as it’s available: slate.com/GistEmail Subscribe to the podcast in iTunes: itunes.apple.com/us/podcast/slate…id873667927?mt=2