What criteria does a company have to meet to be considered a monopoly?

well it can considered it by Monopolies can be considered an extreme result of free-market "Monopoly" can also be used to mean the entity that has total or near-total control of a market. barriers to entry that only hope this helps :)

A monopoly refers to a sector or industry dominated by one corporation, firm or entity. Monopolies can be considered an extreme result of free-market capitalism in that absent any restriction or restraints, a single company or group becomes large enough to own all or nearly all of the market (goods, supplies, commodities, infrastructure and assets) for a particular type of product or service. Antitrust laws and regulations are put in place to discourage monopolistic operations – protecting consumers, prohibiting practices that restrain trade and ensuring a marketplace remains open and competitive. "Monopoly" can also be used to mean the entity that has total or near-total control of a market.

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