Real-estate agents know they can light up the churn-rate in a neighborhood by just moving in one neighbors-from-hell family as it is a self-reinforcing process.

Real-estate agents know they can light up the churn-rate in a neighborhood by just moving in one neighbors-from-hell family as it is a self-reinforcing process. This is the reverse of gentrification. Fanning these waves of uplift and deterioration at the right frequency is what brings home the bacon.