The increase in demand for tire makers, steel and aluminium suppliers is an example of derived demand.
Derived demand is the demand for a good or service as a result of an increase in the demand for another good or service. Labour and raw materials usually have a derived demand.
As the demand for new cars increase, car makers would want to produce more cars in order to meet the increased demand. This would lead to an increase in the raw materials and labour that is needed to make more cars. On the other hand, if there is a decrease in the demand for new cars, there would also be a decrease in the demand for the raw materials and labour that is needed to make more cars.
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