>you define middle class as the middle of the income distribution I don't think that's a good definition for the middle class. There's strong support for the f

>you define middle class as the middle of the income distribution I don't think that's a good definition for the middle class. There's strong support for the fact that income distribution is an exponential distributions - just google "income distribution exponential". A exponential distribution is not symmetrical, so its mean or median is not a great centrality measure, it does agree with intuitions developed from observing, say, a normal distribution (like the weight or height of persons). The mean or median are very far from the mode (the most frequent individual) in an exponential, whereas they're almost identical in a normal.