Need is state of felt deprivation of some basic satisfaction.
Examples of needs:basic human requirements such as for air, food, water, clothing, and shelter. Humans also have strong needs for recreation, education, and entertainment.
Wants are desires for a specific satisfier of these deeper needs
Examples of Wants: These needs become wants when directed to specific objects that might satisfy the need.
An U.S. consumer needs food but may want a Chicago-style “deep-dish” pizza and a craft beer. A person in Afghanistan needs food but may want rice, lamb, and carrots. Our wants are shaped by our society.
Demands are wants for specific products that are backed up by an ability en willingness to buy them.
Examples od Demands: Demands are wants for specific products backed by an ability to pay. Many people want a Mercedes; only a few can buy one. Companies must measure not only how many people want their product, but also how many are willing and able to buy it.