Tips. They're more than a way to show appreciation for good service — they're practically a societal obligation. Today, we explore the history of gratuity in restaurants and examine their modern day impact. Also, members of the restaurant industry share their thoughts on tipping and discuss the questions tips bring up on societal issues of gender, race and class. Guests: Erin McZee , restaurant manager Steve Dublanica , former server and author of Keep The Change Michelle Tyrene Johnson , race