Oldfield , 660 F.2d at 212; see, e.g. , Cameron Dev. Co. v. United States , 145 F.2d 209, 210 (5th Cir. 1944) (“The mere physical adaptability of the property to use as a source of supply of shell marl, in the absence of a market for its commercial production, did not effect an increase in its market value.”).