In the context of transportation, 'deadhead' refers to the act of moving a piece of transportation equipment, such as a bus, train, or truck, when it is not carrying a paying load (either people or freight). It also extends to describe a nonpaid trip or someone who uses a service without paying.
Economic Life refers to the period during which a machine or other property is expected to generate more revenue than operating expenses, thereby staying profitable and justifying its use.
