机会成本：做出高效决策的策略思维（人人需要了解的经济学概念、MBA决策思维工具，查理·芒格的关键思维模型：机会成本是投资决策的过滤器，聪明人根据机会成本做出决策）
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Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.
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Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.
