家庭收入在當地Top15%，就是當地的上中產。中西部多數地方上中產家庭收入門檻可能二十萬，加州灣區上中產門檻至少三十多萬

"Sociologists Dennis Gilbert, William Thompson and Joseph Hickey estimate the upper middle class to constitute roughly 15% of the population."

https://en.wikipedia.org/wiki/Upper_middle_class