there is a prolonged downturn in U.S.passenger air travel,a number of U.S.airlines would very likely cancel some of their orders for new planes.The relationship between passenger air travel and the demand for new planes is referred to as

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The relationship between passenger air travel and demand for new planes is an example of derived demand. This is because the demand for new planes is derived from the demand for air travel by passengers. As passenger air travel decreases, the demand for new planes will also decrease, leading to potential cancellations of orders. The other choices are not relevant to this situation.

There Is a Prolonged Downturn in U