Wait a minute, I thought the evil Bush was eavesdropping on everybody and recording their phone conversations! You mean that it's the pollsters that are spying on us?
Hmmm....I got into a discussion about urban renewal on a listserv and someone wanted the price of new housing to follow a certain price range, with expensive houses integrated in with inexpensive ones. I pointed out this was a stupid idea -- once a house was classified into a certain price range, would its owner be forbidden from selling it at a price outside of that range? Also, when the county reassesses property, they do not examine every property, but rather the assessment of a nearby house carries more influence than one further away.
Someone else took issue with me and asked me why I had chosen to live in such an "economically diverse" area. I crunched the data from census.gov and reported that my lower income neighborhood wasn't as economically diverse as all that. Indeed, it was the affluent part of the county that was economically diverse. That was the end of that discussion.
I'm not sure if that pattern is generally true or not...your comment makes me wonder...hmmm....if you live in a very urban area (say metro LA or Chicago) with very small zip codes, maybe not.