Commodities Trading , 339 U.S. at 123; see Kimball Laundry Co. v. United States , 338 U.S. 1, 5 (1949) (“The value of property springs from subjective needs and attitudes, its value to the owner may therefore differ widely from its value to the taker. Most things, however, have a general demand which gives them a value transferable from one owner to another. As opposed to such personal and variant standards as value to the particular owner whose property has been taken, this transferable value has an external validity which makes it a fair measure of public obligation to compensate the loss incurred by an owner as a result of the taking of his property for public use.”).