When you board an airplane, the boarding order generally starts with first class passengers, then makes its way down to the coach class. Let’s imagine we are boarding an aircraft, and we are in coach class (all the way back in seats 33E and 33F). As we search for a place to store our luggage, we notice that the people in first class are already getting free wine and snacks. Casually dressed people are sitting in some of those first-class seats. This is an annoying but very real example of