suppose an individual is looking to build a house in a plain that is prone to flooding. because of the risk of damage due to flooding, the buyer's top dollar for building the house is only $300,000. suppose the cost of building a house in this area is $310,000. a wealth-creating transaction is not possible since the seller's bottom line (or the cost of building the house) isless than the buyer's top dollar. the difference between the cost of building the house minus the buyer's top dollar is $10,000.00 .