Final answer:
Economic, technological, legal, pricing, and advertising strategies are all types of barriers to entry which prevent or discourage new competitors in a market. They include legal monopolies, and are shaped by laws and government policies that regulate competition.
Step-by-step explanation:
Economic, technological, legal, pricing, and advertising strategies are all types of barriers to entry. These are legal, technological, or market forces that may discourage or prevent potential competitors from entering a market. For instance, a legal monopoly such as intellectual property protection or regulated monopolies can serve as a legal barrier. Meanwhile, high costs of technology or advertising can pose significant economic and technological barriers. These strategies and restrictions can influence the competition in market-based economies, which are often regulated by laws and government policies seeking to encourage competition and regulate issues like anticompetitive mergers, restrictive practices, and natural monopolies.