Control of a key resource is the barrier to entry of the startup of a major league sports team because existing professional teams have contracts with the best players and long-term leases on stadiums.
A monopoly is a market in which there is only one seller or a few sellers and no close substitutes for the seller's product or service. The term "monopoly" is technically applied to the market as a whole, but it is now widely applied to the sole vendor in a market as well.
The market may become a monopoly when one team has major control over a resource required for the startup of a team.
Thus, Control of a key resource is the to entry.
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