On this episode of Marketplace Weekend, guest host David Lazarus has the need, the need ... yes, for speed. Author and journalist John Ronson speaks about the lightning-fast world of internet shaming. We discuss speed in our economy — in the market, in retail, in fast food and even in music. Marketplace's new fill-in host and correspondent Molly Wood explains high frequency trading, Marketplace Tech's Ben Johnson talks fiber-optic internet, and DJ The Gaslamp Killer tells us his secrets to a fast-paced, heart-pumping playlist. Plus, we discover how to take advantage of flash sales and cheap airfare on the fly.