Mergers usually occur between two companies with complimentary business activities, who want to work together and dominate an industry.
These usually lead to oligopolies and in some cases, a monopoly over the market. This can lead to less choice for the end customer and even price hikes.
A lack of competition is never good for a market
Eventually too many jobs, businesses and third-party contractors work for a smaller number of companies and become exposed to market failures.
