Technically, no constraints of any type are necessary for a true free market. However, there is a strong possibility of a monopoly developing when multinational corporations exploit this position to expand their markets.
Monopolies are forbidden in free-market economies as they limit customer alternatives and impede competition. Antitrust laws are in existence in the US to prevent monopolies, guaranteeing that one company cannot dominate a market and take advantage of its dominance to take advantage of its customers.
In a true free market, predator multinationals are unable to establish monopolies. Government assistance and interference are necessary for predatory behavior and monopoly power, proving that the market is not free.
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