Several firms are operating in a market where they take the other firms' response to their actions into account. This market is

An Oligopolistic market.

Explanation:

An Oligopolistic market is a market where they are very few supplies of a product and as such they charge higher prices due to the reduced competition.

In such a market the firms have to be very mindful of how their actions will impact that of their competitors because with such few competitors, they could easily lose customers if another oligopoly decides to change prices for instance.

They generally avoid doing so though because a price change by one will lead to a price change by others which would end up reducing the total amount that each firm makes as the prices will usually go downwards not up unless they collude.

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