Market power and competition — Economics, 14–17 years
Why a seller with few rivals can influence prices, choices and rules more than a seller facing many competitors.
When choice is not balanced
Market power is the ability of a seller or buyer to affect the price or terms of an exchange. With many rivals, customers can switch and firms must compete. With few rivals, leaving may be difficult, so the powerful side can often charge more, offer less or set stricter conditions.
The problem of weak competition
This idea answers a problem that simple supply and demand can hide: what happens when sellers are not free to compete with one another? Economists study market power because weak competition can reduce choice, quality and innovation, while letting profits or influence grow.
One internet provider
Imagine a town with three internet companies. A 100-megabit plan costs €25 from each, so switching is easy and no firm can raise the price much. If one company becomes the only provider, some households may accept €40 because changing town or going without internet is costly. Its market power has increased.
A high price proves nothing by itself
A reasonable mistake is to call every high price market power. Prices can also be high because production, transport or materials cost more, or because a product is genuinely scarce. To identify market power, ask whether customers have realistic alternatives and whether sellers can be replaced.
Apps, shops and jobs
Market power appears when one app controls access to many users, one shop dominates a small town, or a single employer is the main source of local jobs. Competition rules, price comparisons and worker organisation can limit this power. The details matter: not every large firm is automatically harmful.
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