a) A railroad handcar.
b) The subway.
c) A titanium Bianchi road bike, which I ride to the end of my driveway before getting in my Audi.
d) A sapphire-encrusted palanquin held aloft by 12 of my most trusted manservants.
Even though it's widely used by politicians, the term "middle class" is notoriously vague. Almost everyone identifies themselves as middle class, regardless of their income. Are you part of the middle class? Take our quiz and find out.