Demand

Demand is the quantity of consumers who are willing and able to buy products at various prices during a given period of time. Demand for any commodity implies the consumers’ desire to acquire the good, the willingness and ability to pay for it.

For example, if a consumer is hungry and buys a slice of pizza, the first slice will have the greatest benefit or utility. With each additional slice, the consumer becomes more satisfied, and utility declines. In theory, the first slice might fetch a higher price from the consumer.