When one seller becomes the only practical choice
A company does not need to own every possible alternative to gain substantial market power. It may be enough for customers to depend on its product and for rivals to face steep obstacles to entering or expanding. Those obstacles can include the cost of building a network, control of an essential input, or the difficulty of persuading customers to switch.
Once competitors lose the ability to attract customers, the remaining company can make decisions that a rival market would normally punish. It might raise prices, reduce service, or offer fewer choices. Customers who dislike the change cannot easily take their business elsewhere, so the usual pressure to improve weakens.
Why rivals may struggle to return
The advantage can reinforce itself. A larger customer base may make a service more useful, as when more users draw more participants to a platform. Revenue can then fund better distribution or lower prices that are difficult for a smaller entrant to match. Even if a new competitor appears, it may need to overcome both the incumbent’s scale and customers’ reluctance to leave familiar systems.
This does not mean every successful company can dictate terms indefinitely. Buyers may switch to substitutes, new technology can change what customers need, and rules may limit certain conduct. The key question is whether customers have a realistic alternative—not merely whether another company exists somewhere in the market. When switching is costly and alternatives are weak, a price increase or service cut can reach customers who once could have answered by walking away.
