1/ Definition of competition law:
In principle, free competition is simply Darwin's theory applied to the business world. Therefore, competition can be brutal, unsightly, unbalanced, etc., in many ways.
But competition can also be a source of balance and peace for consumers, but not only for them, and especially for companies that are not ranked first. Why? Well, without free competition, there would only be state-owned or non-state monopolies, state-owned or non-state oligopolies, etc., concentrated groups or other conglomerates. Free competition, in theory and in practice, allows anyone to emerge, provided they have the right product or service. Moreover, despite the fact that state antitrust institutions have been established, as in France, for example, with the competition authority, in reality these authorities serve no purpose. To take a simple example, through corporate membership contracts or other, more specifically, exclusivity contracts, licensing agreements, brand licensing agreements, etc., prices are fixed in France, but everywhere else on the planet by large companies. For example, everywhere in France, the Mac mini M4 costs €699, give or take a few dozen euros.
In fact, for a consumer, the only option is to move for other country, case on case, to compare and find better prices : exempli gratia, tobacco in spain rather than France, or to go back to Mac Mini M4, the better is to buy it in Switzerland for more or less : 570 CHF. But it's not practice nor perfect because currency rates for Switzerland and traverl costs for Spain. And the European Union regulatory decide the least saying because the market and neither efficient nor maximized. Here is for instance, a pool of benefit for consumer.