Small and medium enterprises are by many national governments and experts of economics called the most important elements of an economy. Big enterprises are in many countries very similar: they func-tion on the global market, with global partners and in global realities. Small and medium enterprises, which are specific in every country, are more interesting. They function in different realities, struggle with other market opportunities and have to do everything unaided although they must suffer alone for any and all their mistakes. They are the most innovative part of an economy, the most flexible and subject to the biggest risk; at the same time, they accept a bigger risk then large companies. One of the most interesting issues is the diversity of small and medium companies in different countries, the ways of adapting to the market and their function in this market.