I believe the answer is: Barrier of entry
When one specific market is controlled by a big organization that possess the ability to utilize large number of resources, that organization could definitely create a cheaper product compared to smaller organizations who do not.
Because of this, a barrier is created for new organization who want to compete since it is impossible for them to take the big organization heads on in term of pricing.
Answer: repute barrier or barrier to entry.
A natural monopoly's preemption of entry by other firms by exploiting its economies of scale is an example of barrier to entry.
This kind of monopoly is when a pre-existing business, who has a well established customer base, a good reputation in the market and cost effective prices sets up a monopoly because of its size, prices or power and causes a barrier to entry for all the new business who wish to enter.
