If one company in an oligopoly raises its price while the other companies do not, the higher-priced company will experience a slight decline in sales.
If there is fierce rivalry, which would push prices down and produce no profits for anyone, oligopolists may behave almost exactly like ideal rivals. Oligopolists may be able to act like a monopoly, raise prices, and provide a consistent flow of high profits if they work together in a conspiracy.
The resistance to price increases by oligopolistic businesses is explained by the kinked-demand curve. When one of them raises the price, the competitor gains market share.
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