Final answer:
Predatory pricing is a short-term price reduction strategy used to retaliate against a competitor's actions, such as introducing a new product.
Step-by-step explanation:
Short-term price reductions that can be used to retaliate against a competitor's actions, such as introducing a new product, are called predatory pricing. Predatory pricing is a strategy where an existing firm uses temporary price cuts to discourage new competition from entering the market. This practice is a violation of U.S. antitrust law, but it can be difficult to prove.