Financial Crime and Corruption by Samuel Vaknin

2. A larger scale of operation does introduce

economies of scale (and thus lowers prices). This, however, is not infinitely true. There is a Minimum Efficient Scale - MES - beyond which prices will begin to rise due to monopolization of the markets. This MES was empirically fixed at 10% of the market in any one good or service. In other words: companies should be encouraged to capture up to 10% of their market (=to lower prices) and discouraged to cross this barrier, lest prices tend to rise again.