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黄石2024-07-29 11:03:19
同学你好。CAPM的假设有:
◼ Access to information for all market participants, meaning that all information is freely available and instantly absorbed【投资者可以免费获得所有可用信息】
◼ All market participants have the same expectations about the returns and risk for the same set of assets (i.e., the homogeneous expectations【同质预期假设,即投资者对于同一组资产的收益和风险的预期全部都是相同的】
◼ All market participants make their investment decisions based on the mean and variance of returns【投资者使用均值方差分析框架】
◼ No transaction costs, taxes, or other frictions【市场无交易成本、无税收以及其它市场摩擦】
◼ Allocations can be made in an investment of any partial amount【资产无限可分,例如投资者可购买0.1股】
◼ All participants can borrow and lend at a common risk-free interest rate【投资者可以按相同的无风险利率借入或借出资金】
◼ Any individual investor’s allocation decision cannot change the market prices (i.e., investors are “ price taker ” instead of price maker 【单个投资者的交易不会改变市场价格。】
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APT的假设有:
◼ Asset returns can be explained by systematic factors that affect all securities (i.e., all asset returns follow a factor structure) 【资产收益率可被系统性风险因子所解释】
◼ There are a large number of securities, which allows (at least some) investors to construct and hold the well diversified portfolio 【市场上有足够多的证券,使得至少部分投资者可以构建并持有充分分散组合】
◼ There are no arbitrage opportunities among well diversified portfolios 【充分分散组合之间不存在任何套利机会】


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