In economics, derived demand is demand for a factor of production or intermediate good that occurs as a result of the demand for another intermediate or final good. In essence, the demand for, say, a factor of production by a firm is dependent on the demand by consumers for the product produced by the firm. The term was first introduced by Alfred Marshall in his Principles of Economics in 1890. Demand for all factors of production is considered as derived demand. This is similar to the concept of joint demand or complementary goods, the quantity consumed of one of them depending positively on the quantity of the other consumed.Example if any goods is in production process by demanding capital automatically speed of production will increase that is directly demand or derived demand Examples Producers have a derived demand for employees. The employees themselves do not appear in the employer's utility function; rather, they enable employers to profit by fulfilling the demand by consumers for their product. Thus the demand for labour is a derived demand from the demand for goods and services. For example, if the demand for a good such as wheat increases, then this leads to an increase in the demand for labour, as well as demand for other factors of production such as fertilizer. For another example, demand for steel leads to derived demand for steel workers, as steel workers are necessary for the production of steel. As the demand for steel increases, so does its price. The increase in price means manufacturers of steel can gain more in revenue if they produce more steel, thus leading to a higher demand for the resources involved in producing steel. Demand for transport is another good example of derived demand, as users of transport are very often consuming the service not because they benefit from consumption directly (except in cases such as pleasure cruises), but because they wish to partake in other consumption elsewhere. Another example is the derived demand for labour - the amount of labour demanded in the production of soap depends upon the demand for soap, that workers help produce Derived Demand Curve The concept of the derived demand curve for an input was developed by Alfred Marshall. It can be constructed under two assumptions: First, production conditions, the demand curve for the final good, and the supply curves for all other factors of production are