We can go through business by business and see the rise of monopolies and oligopolies. Universal owns half of the US music market - Universal, Sony and Warner own over 80% of the US music market. Accounting is done by the Big Four, advertising by its own Big Four.
Just down the line - consolidation, oligopoly, monopoly. That is what markets produce. Standard Oil reversed its breakup into ExxonMobil, as did the Baby Bells into Verizon and AT&T. Even the government intervention into the monopolies gets reversed.