All of the mistakes are in this paragraph:

> The researchers also claim that harbinger households voluntarily cluster: that when a harbinger household moves, it is likely that it will move to another habringer ZIP code (and nonhabringers move to nonhabringer households). Moreover, harbingers don't appear to learn their preferences from one another — a nonhabringer household that locates in a harbinger ZIP code doesn't alter its purchasing and political contributions to "loser" products and candidates.