Final answer:
During the maturity phase, market consolidation can be expected to result in the broadening of market definitions and increased competition. However, there is a concern that companies with a monopoly may use the opportunity to expand their reach across national borders.
Step-by-step explanation:
In terms of market consolidation during the maturity phase, the common expectation is that the definition of markets will become broader due to increased competition from faraway places. However, this broadening does not necessarily mean that antitrust authorities can relax. There is also a concern that companies with a local or national monopoly may use the new opportunities to extend their reach across national borders, making it difficult for national authorities to respond.