If you ask people why they tip, they'll say it's obvious. They tip for good service, of course. It's a reward for a job well done.
But a leading theory on tipping suggests that's not really why we do it.
Studies show that the size of the tip doesn't have much to do with the quality of service. The weather, how sunny it is, what kind of mood people are in, these factors matter just as much as how satisfied the customers are with the service they receive.
On his newest album, Hi-Fly, Sachal Vasandani pays tribute to jazz pioneers such as George Gershwin and Jon Hendricks, and also showcases some of his own music. A self-described "nice Indian kid from Chicago," Vasandani says his parents helped instill in him a love for jazz, but that they've always broadened his horizons, too.