Which market structure consists of a few firms, high barriers, and products that may vary?

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Having a market with only a few firms means each company must consider how its rivals will react to any price or output move. That interdependence shapes strategic choices, like setting prices or deciding how much to produce, because a change by one firm can provoke a response from the others. High barriers to entry keep new competitors from entering and expanding the group, preserving the small number of dominant players. The products in such markets can be either differentiated or similar, so you’ll often see some variety alongside competition on price and other factors. This combination—few firms, high barriers, and potential product variation—matches an oligopoly. By contrast, a monopoly has a single seller, monopolistic competition has many firms with differentiated products but low barriers, and pure competition has many firms with identical products and very easy entry.