Definition of change

It is called a change to the process by which a certain State of things happens to another State. From this basic notion, every field of human knowledge adopts a concept of change that is her own. Thus, one can speak of the use of the term instead in economics, biology, philosophy, etc. Each of these variants has peculiarities that only explain in the context of that know. One of the most common uses of the word 'change' can be found in a market economy. There is referred with this word to the bartering of goods and services for money. In this context it is usually we talk about free trade, that is, that this trade in goods and services should be exercised by the different actors of the economy without imposition of a higher authority such as the State; at most, there may be regulations of this, but you can not direct the economy completely. This free exchange situation is which determines the price of various goods and services in the balance between supply and demand.
Another use of the term change may offer it the area of philosophy. It should be noted that since the dawn of this discipline, the concept of change was the subject of arduous and painstaking reflections. In fact, one of the first and main problems arising for philosophical reflection is the permanence and change. In this case the difficulty lies in establishing the cause by which a particular object can mutate its State and at the same time be the same. Thus, for example, a person is constantly changing and at the same time it is the same. For this question different answers, being the best-known were those of Parmenides, Heraclitus and Aristotle; the first denied the existence of change, the second established that everything was mutable and the third established that some qualities were as mutable than others not.
In biology, the change is marked by the evolution. Thus, when a body's cells divide they adopt mutations that can be passed to later generations; If these are an adaptation to the environment will increase the chances of that species to survive and reproduce.
So far, there have been some variants of "change" that are most commonly used. However, it is possible to find a number of them that will depend on the context in which stipulated.