the answer is that some people think it is a necessity, but it used to be a luxury in the 80's
there are none
Is orthodoncia a luxury or a necessity
For most homes the phonograph was a luxury good. However, for a radio broadcasting station the phonograph was a necessity good.
If you often have guests at your house, and you prefer a formal dinner, than it is a necessity. Otherwise, it can be considered a luxury.
being ethical in business is no longer a luxury. it a necessity
It depends on whether electricity is necessity or luxury. In the US where electricity is a necessity, the demand is likely to be inelastic In Africa where electricity is luxury, the demand is likely to be elastic
a good that is perceived as a necessity will be purchased even if the price rises
a good that is perceived as a necessity will be purchased even if the price rises
a good that is perceived as a necessity will be purchased even if the price rises
a good that is perceived as a necessity will be purchased even if the price rises
a good that is perceived as a necessity will be purchased even if the price rises