Value Change

See: Value.

What changed? Whatever the market was willing to pay for it. Why did the market's opinion change? Was the neighborhood gentrified, so the finest crack dealer house in the city suddenly became Yuppytown? Or was the asbestos in the roof actually removed this time, and by being generally carcinogen-free, the home added $50k in value?

Some fundamental force likely happened (not just a more competitive market, or inflation) to make the value of whatever's being sold...change.