What are some of the different types of barriers to entry that give rise to monopoly power? Give an example of each. The most common types of barriers to entry are A. Exclusive rights, such as copyrights, patents, and licenses, and the availability of close substitutes, which can increase the price elasticity of demand. B. Environmental regulations, where production requires permits, and exclusive rights, such as copyrights, patents, and licenses. C. Exclusive rights, which can result in natural monopolies, and economies of scale, such as copyrights, patents, and licenses. D. Environmental regulations, where production requires permits, and economies of scale, which can result in natural monopolies. E. Exclusive rights, such as copyrights, patents, and licenses, and economies of scale, which can result in natural monopolies.