But property taxes already face this challenge: the assessing authority has to specify a value – which may then be disputed by the property-owner in a costly ap

But property taxes already face this challenge: the assessing authority has to specify a value – which may then be disputed by the property-owner in a costly appeals process. This proposal lets the actor with the keenest interest and best knowledge of the property set a value, and lets the 'challenge' occur in the marketplace, by someone who's willing to buy it at that price. It lets the "brokers" and other experts of the world set the assessed value, by their actions (or potential actions), at a higher resolution than the current processes (which wait for actual sales or later bureaucratically-settled re-assessments).