The Economist wrote about how the presence of a First Class section on an airplane affects passengers:

• According to a study passengers are 3.8 times more likely to have incidents of “air-rage” if they’re on a flight with a first-class section.
• That proportion doubles if they have to walk through the first class section to find their seat.
• This is broadly in line with other findings that show that seeing your own income increase doesn’t make you happy – unless other people’s income decreases.
• What this means for broader society and economic policy as a whole – that wealth satisfaction isn’t about needs but, instead, about comparative position – remains an open question.

Read more here.

Source: The Economist