Amazon.co.jp: 誰も書かなかった不動産投資の出口戦略・組合せ戦略: 猪俣淳: 本
Barriers to entry - Wikipedia
In theories of competition in economics, a barrier to entry, or an economic barrier to entry, is a fixed cost that must be incurred by a new entrant, regardless of production or sales activities, into a market that incumbents do not have or have not had to incur.[1] Because barriers to entry protect incumbent firms and restrict competition in a market, they can contribute to distortionary prices a
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