Final answer:
Predatory pricing (undercutting) is an example of price fixing (collusion) among firms.
Step-by-step explanation:
Predatory pricing (undercutting) is an example of price fixing (collusion) among firms. It occurs when an existing firm lowers its prices significantly to drive out a new entrant from the market, and then raises prices again once the competition is eliminated. This practice aims to deter new firms from entering the market and reduce competition.