The market is traded on a daily basis, ie the exchange of various goods and services. There are various market definitions, and the market is easiest to describe as the place where this exchange of goods and services is happening. The market would not have existed if there was no supply and demand. It is not worth having a product that no one wants or looking for a product that does not exist. Because of this, the bid and the demand go together, but if none of them there is no other. When we touch the markets, it is inevitably an independent competition. Competition is easiest to explain as a competition. Competition can take place between two or more individuals. They can compete for a variety of things, and the competition comes from the fact that the competitors fight for a thing that can not be shared. This work will discuss market conditions and types of competition. To a lesser degree, other types of competition will be touched, and to a greater degree, the monopoly and monopoly power will be discussed as well as the title of this work. Through various pictures, tables and curves we will try to explain in more detail the monopoly and talk about the sources and barriers of the monopoly. They will talk and influence the state that is controlled by their laws and regulations as a monopoly because a monopoly company can exploit what is the only market. For an end as an example of a monopoly, HEP d.d.