Industries with oligopoly and monopoly structures are more likely to sustain their operations in the long run. Oligopoly – Industries with few dominant players, such as telecommunications, banking, and oil, have strong market control, brand loyalty, and pricing power. They benefit from economies of scale, making it harder for new entrants to compete. Monopoly – Businesses with exclusive control over a product or service, such as utility companies, can easily sustain operations due to the lack of competition and government support. On the other hand, perfect competition and monopolistic competition structures face more difficulty in sustaining operations. Small businesses in these structures struggle with price wars, high operational costs, and lower brand differentiation, making them more vulnerable to economic crises. In terms of market dominance and exit, monopolies can dominate easily due to legal barriers and exclusive control, while businesses in perfect competition can exit quickly due to low entry and exit barriers.[tex][/tex]