The increasing wealth disparity has geographical ramifications, and Charles Murray analyzes which US zip codes are more insulated from the rest of the normal, low-middle class rabble.

[PBS] Editor’s Note: "A few weeks ago, we asked you to take the bubble quiz, based on Charles Murray’s 2012 book, “Coming Apart: The State of White America, 1960-2010,”meant to test how well you knew the average white American. Today, Charles Murray continues his exploration of the scores and ZIP codes from the bubble quiz in a second post. You can find his first post analyzing the results here."

"If you want your child to grow up clueless about mainstream white America, what are the ZIP codes that have the best track record?

"To answer that question, I used the 50,464 cases in which the respondents provided both a score on the bubble quiz and the ZIP code where they lived at age 10. (These were data available as of Wednesday morning when I started this exercise.) I asked my statistical software to calculate the median bubble score for every ZIP code represented in those 50,464 cases. Since I couldn’t make any judgments about ZIP codes that were represented by just a few people, I chose 10 as the lower limit of scores that I would examine more closely. There’s still a lot of room for oddball results with a sample size of 10, but this procedure gave me a useful starting point for examining patterns."--Charles Murray, the PBS News Hour