4. A necessity is something that will be bought at the same rate and have the same demand for even in hard times while a luxury is something that will not be bought at the same rate and will not have the same demand for in hard times. Usually the demand for a luxury will decrease and the rate at which it will be bought up will slow down. | 4. A necessity is something that will be bought at the same rate and have the same demand for even in hard times while a luxury is something that will not be bought at the same rate and will not have the same demand for in hard times. Usually the demand for a luxury will decrease and the rate at which it will be bought up will slow down. |