UPSC CDS GS Economy Questions Part 2

Demand for a commodity refers to the quantity demanded at acertain price during any particular period of time. The demand for a commodity is its quantity which the consumers are able and willing to buy at various prices during a given period of time. So, for a commodity to have a demand, the consumer must possess willingness to buy it, the ability or means to buy it, and it must be related to per unit of time, i.e., per day, per week, per month orper year.