One key characteristic that is distinctive of an oligopoly market is that Group of answer choices the demand curve facing each firm is downward sloping, with a marginal revenue curve that lies below the firm's demand curve. the decisions of one seller often influence the price of products, the output, and the profits of rival firms. there is only one firm that produces a product for which there are no good substitutes. there are many sellers in the market and each is small relative to the total market.

The decisions of one seller often influence the price of products, the output, and the profits of rival firms.

Explanation:

An oligopoly is a market structure where there are only a few sellers. Therefore, around two or more firms have control over the market. Collectively, they can influence the prices and supply.

This ultimately results in high-level competition between these sellers. Since there are a few sellers in the oligopoly structure, each of these company's profit levels not only depends on the decisions made by them but also on the decisions made by their rival firms.

Hence, option no. 3 "the decisions of one seller often influence the price of products, the output, and the profits of rival firms" is correct.

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