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The Petrol Market - Oligopoly - What are the main features of an Oligopoly? •Product branding: Each firm in the market is selling a branded product. •Entry barriers: Entry barriers maintain supernormal profits for the dominant firms. It is possible for many smaller firms to operate on the periphery of an oligopolistic market, but none of them is large enough to have any significant effect on prices and output •Inter-dependent decision-making: Inter-dependence means that firms must take into account the likely reactions of their rivals to any change in price, output or forms of non-price competition. •Non-price competition: Non-price competition is a consistent feature of the competitive strategies of oligopolistic firms.