Men’s activities in the early days of their existence were concentrated on the acquisitions of sustenance. With the passage of time, however, they began to learn how to use certain things which were not essential for their survival but important for their comforts. In modern terms, those things would be described as luxuries. As they progressed further, however, and sought to increase their comforts, they began to regard those things as necessities. This has been men’s attitude towards all things, that is, in time they begin to regard as necessities what they originally regarded as luxuries.

We consider almost all of the things which were regarded only as luxuries a few years ago to be indispensable to our existence today. In the case of the radio, it plays a part of modern life. The expansion of education has strengthened men’s curiosity for world affairs. Consequently, the radio has become one of the main sources of information. It also provides much entertainment to a variety of people. Like radio, motor vehicles were firstly used by rich people. Those engaged in trade afterwards. They are regarded as necessities by almost all working men. This owes to the great economic and social changes having occurred in the last few decades. More and more industries are being established in various parts of the world, with the result, that the activities of man too have increased tremendously. Workers have to travel great distances to earn their livelihood, and the limited time at their disposal compels them to regard motor vehicles as indispensable to their activities.

The main reason for acceptance as necessities what were at first regarded as luxuries is that, in course of time men come to realize the benefits and comfort that they derive from the use of those things. Almost every invention or discovery benefits society in some way, and when the advantages of using a