Satisfaction is only a temporary feeling of being content, for human desire, stimulated by both physical and mental needs, connects with changes in our world, our society and ourselves. It is true that people are never satisfied with what they have in the long run and they always want something more or something different. This unsatisfactory perception, together with the desire for something more or different, exists perpetually for three major reasons.
First of all, the continuous emergence of new products constantly motivates people's desire to get things new and different for better. For example, people replace their computers with new ones that are quicker in speed and more in functions long before their machines get worn-out. This happens as a result of the rapid development of science and technology that enables improved computers and softwares to come out into the market at a much faster speed than the speed for a computer to get old. Nobody will not be satisfied with iphone4 when iphone5 appears. People are always longing for something new and better.
Secondly, people's improvement in financial status invites their dissatisfaction with what they have. A good example of this is the purchase of a newer house on a better location with a nicer view when one has saved enough or when one gets a raise knowing that paying back a mortgage is not a problem. From this perspective, people's dissatisfaction goes along with the development of economy.
Finally, the vanity to keep up with the neighbors and friends also spark off people's dissatisfaction with what they have. A car is originally meant to be a means of transportation. However, there are people who trade in their nice cars for a Benz, BMW, Volvo or a Luxury simply because their friends or neighbors drive these makes. When food is no longer a problem, people began to pursue a life of high quality.
Superficially, people's endless discontents with what they have sounds greedy and unpleasant. But it is, in fact, this discontent of our humans' that pushes our society to continuously create things new and different to meet people's desire.