Imagine that there is a psychological line that most bosses want to reach, for example "to become a millionaire". This desire is the same whether you live in a richer or poorer country, and whether you have twenty or two thousand employees. The word "millionaire" is simply a magical word which does not automatically adjust to e.g. "3.2-million-aire" just because you have more employees or live in a different country. Also, "millionaire" these days in Eastern Europe refers to million euro, just like in Western Europe, and not much different from million dollars in USA, i.e. it is country-independent.

Now if we assume that the million is a fixed psychological goal, this is easier to reach in a large company than in a small one. If you have two thousand employees, you need to make 500 euro per employee. If you are okay with becoming a millionaire in five years, that's 100 euro per employee per year, which is barely noticable. But if you have twenty employees, during five years it makes 10 000 euro per employee per year. They are going to feel that. (Also, the higher the costs and average salaries in a country, the less the employees will feel those 100 or 10 000 euro per year.)

According to this model, employees in small companies in Eastern Europe should be paid very little. But their bosses should still become rich.