Which of the following is not an example of a potential barrier to entry in an industry? Group of answer choices At the turn of the 20th century, De Beers controlled the vast majority of the world's diamond mines. The production and delivery of electricity displays economies of scale over the entire size of the market for energy. When I invent my new, genius board game I will be applying for a patent. Entrepreneurs have incentive to enter markets when they observe profits being made