Q: How much is my house worth?
A: Whatever the highest bidder is willing to pay for it.
Those of you who took an introductory Economics class in high school or college may remember learning that prices are set “at the margin”. That’s a fancy way to say that prices are set by the person (or people) willing to pay the most.
This person willing to pay top dollar is called the “marginal buyer”. Most of us don’t really think about him much, but he (or she) is very, very important.