1.4.5.1. Economic Use.For purposes of just compensation, opinions of market value must be based on an economic highest and best use. Therefore, appraisals in federal acquisitions cannot be based on noneconomic or nonmarket uses. To be an economic use, the use must contribute to the property’s actual market value, and there must be competitive supply and demand for that use in the private market. Whether or not a particular use is economic and therefore appropriate to consider depends on the relevant market, not the use itself. This topic is discussed in depth in Section 4.3.2.3.