today's luxuries are tomorrow's necessities

Tweet

Compared to necessities,luxuries can refer to something pleasant and often expensive thing that is not necessary. From a jistorical point of view, most things which were luxuries when they first came into being became necessities later. When the electric bulb was first invented in the U.S.,it was such a luxury that only government bodies could afford to use it. Nowadays .however ,it has reached every part of the world . It is the same case with telephone ,TV,cell phones and a lot of other things ,which become a necessity when it is widely used. I think there sre mainly three resxons responsible for the faster speed of this chang process. For one thing .science and technology are highly developed . For an other ,the technology can be quickly transferred to products.Morever,people's purchasing power has increased remarkably.