You can thank income inequality and inflation as well as varying cost of living for the confusion.

I'll give you an overly generic answer for each class for handling a $600 expense:

Low class: I'm fucked 

Lower middle class: here's the credit card and my vacation is fucked

Middle class: here's the credit card

Upper middle class: here's the bank card

Upper class: I think I've got a guy that deals with these trivial matters