It does, but: "In the AKZO v Commission case,[79] the undertaking is presumed to be dominant if it has a market share of 50%. There are also findings of dominance that are below a market share of 50%, for instance, United Brands v Commission,[74] it only possessed a market share of 40% to 45% and still to be found dominant with other factors. The lowest yet market share of a company considered "dominant" in the EU was 39.7%.If a company has a dominant position, then there is a special responsibility not to allow its conduct to impair competition on the common market however these will all falls away if it is not dominant." https://en.wikipedia.org/wiki/Monopoly