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2024-10-11 17:07Bad economic times also tend to be associated with declining risky asset payouts (declining earnings and dividends for ordinary shares and defaults for bonds), leading to declining asset prices. The result is that the covariance term for risky assets is typically negative...為什么書上說,經(jīng)濟(jì)不好的時(shí)候cov <0 ?
所屬:CFA Level II > Portfolio Management 視頻位置 相關(guān)試題
來源: 視頻位置 相關(guān)試題
1個(gè)回答
愛吃草莓的葡萄助教
2024-10-14 10:39
該回答已被題主采納
同學(xué)你好。經(jīng)濟(jì)不好時(shí),跨期替代率上升,資產(chǎn)價(jià)格是下降,協(xié)方差小于0.
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追問
那為什么課上老師講一般,cov < 0, 經(jīng)濟(jì)不好的時(shí)候 cov>0 ?
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追答
同學(xué)你好。條件不一樣。同學(xué)你提到的是風(fēng)險(xiǎn)資產(chǎn)在經(jīng)濟(jì)差的情況下的covariance term,而視頻中講的是無風(fēng)險(xiǎn)債券在經(jīng)濟(jì)差的情況下的covariance term。
在經(jīng)濟(jì)差的情況下,風(fēng)險(xiǎn)資產(chǎn)價(jià)格通常是下降的,無風(fēng)險(xiǎn)資產(chǎn)價(jià)格通常是上升的。而經(jīng)濟(jì)差的情況下跨期替代率是上升的,因此會(huì)出現(xiàn)covariance term不同的情況。 -
追問
... likely expecting their future consumption and equity returns to be positively correlated. ......In other words, the covariance between risk-averse investors’ inter-temporal rates of substitution and the expected future prices of equities is highly negative, resulting in a positive and large equity risk premium.
您好,前一段講,cov(c1, r) > 0,
c1↓, MU1↑, m↑, r↓, P↑, cov(m, P) > 0, 第二段說,cov(m, P) < 0, 哪里錯(cuò)了? -
追答
同學(xué)你好。就是上面解釋呀。在經(jīng)濟(jì)差的情況下,風(fēng)險(xiǎn)資產(chǎn)價(jià)格是下降的,無風(fēng)險(xiǎn)資產(chǎn)價(jià)格是上升的。同學(xué)你前面寫的大于0,是無風(fēng)險(xiǎn)資產(chǎn)呀,后面小于0是風(fēng)險(xiǎn)資產(chǎn)呀。在經(jīng)濟(jì)差差的情況下都買無風(fēng)險(xiǎn)資產(chǎn)呀,價(jià)格被買上去了;都賣無風(fēng)險(xiǎn)資產(chǎn),把無風(fēng)險(xiǎn)資產(chǎn)價(jià)格賣下去了。
首先你得弄清楚是風(fēng)險(xiǎn)資產(chǎn)還是無風(fēng)險(xiǎn)資產(chǎn),第一步資產(chǎn)類型都判斷錯(cuò)了,后面結(jié)論就不用看了。
