How the Sale Price of One Property Affects its Neighbours

Just saw an episode of Numb3rs from Season 4 (Number 11, I think, "Breaking Point") and the villain was a real estate developer who kidnapped a reporter. As part of finding the bad guy, as he does every week, Charlie Epps uses mathematics to crack the case. In the process he gives a fair explanation of how real estate values are affected by neighbouring properties. Actually, it's better than fair, it's great.

Listen here.