Questions: In an oligopoly, increased sales on the part of one firm will by the other firms.

The answer is be noticed immediately.

In an oligopoly, firms are highly interdependent, and any change in one firm's strategy, such as increased sales, is likely to be noticed quickly by other firms. Therefore, this option is less accurate.

This option is incorrect because, in an oligopoly, firms closely monitor each other's actions due to the limited number of competitors and the significant impact that one firm's actions can have on the market.

In an oligopoly, firms are few and each has a significant share of the market. As a result, they are highly sensitive to each other's actions. Any increase in sales by one firm is likely to be noticed immediately by the other firms, as they continuously monitor the market to maintain their competitive positions.