Used in noncollusive oligopolistic markets, the practice of a dominant firm to signal upcoming price changes to other firms in the industry is known as price leader.
This is a market structure, whereby few players are having advantage over others in the same industry.
Oligopoly occurs when most products or services are provided by only a few large companies or business. In other words, it is a market structure where a few large firms dominate an industry; which are airlines, oil and computers.
Here, economy in a country or all around the world is controlled by big business, and therefore small or emerging business cannot compete due to high costs and loyalty of customers to important branches or producers.
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