Final answer:
Dumping in the world markets is most likely to increase during economic booms, due to the practice of predatory pricing and anti-dumping laws.
Step-by-step explanation:
Dumping in the world markets is most likely to increase during economic booms, as explained by anti-dumping laws and predatory pricing. Dumping refers to the practice of selling goods below their cost of production. Foreign firms may engage in predatory pricing by temporarily selling goods at low prices to drive out domestic competition. Once the competition is eliminated, they can raise prices and increase their market share. Dumping cases tend to be countercyclical, increasing during recessions and decreasing during economic booms.