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November 24, 2008
CFA L1問題-你問我答(九)


請教兩個問題..

 

1.of the two statements of call and continuous markets:

Statement 1: Dealers in call market and continuous market have different functions: in continuous market, they would attempt to derive a new equilibrium price that would reflect the imbalance and take care of most of the orders; in call markets, dealers have to buy or sell for their own account at specified bid and ask price.

Statement 2: The stock exchange has to choose either call markets or continuous markets trading structure because the two trading structures are so different that the existence of two structures will make trading ineffective.

Answer: 1-false, 2-false

請問statement 1是那裡不對呢?

 

2. What is the lower bound for a 6-month European put option on stock index if the current stock index is 1000, the strike price is 1050, the risk-free interest rate is 5%, and the dividend yield is 2%?

Answer: P >= max [0, 1050/((1+0.05)^0.5) - 1000/((1+0.02)^0.5) ]

請問 the lower bound of put 不是應該是max [0, X/((1+r)^t)-S]?

為什麼這邊還需要再除一個dividend yield?

希望有人可以幫忙解釋一下,多謝囉~~~

 

答覆:

問題一:

聲明1的意思是說喊價市場與連續市場有不同功能:

連續市場反應市場失衡的一個新均衡價格,而且處理大部分的下單。

交易商在喊價市場,須以特定的買賣價為自己的帳戶買或賣。

喊價市場與連續市場的主要特性分別如下:

喊價市場:1.在一個特定時間點成交。

          2.買賣單在同一時間點彙整,再決定一個可以執行大部分下單的價格。

          3.較少證券與較少參與者的市場。

連續市場:1.只要開盤到收盤之間的任何時間皆可下單成交。

          2.正常單可以在不影響市價下成交。

          3.交易量較大的市場。

因此,聲明1的區別方式不正確。

 

問題二:

在對應資產(股票指數)未發放股利時,lower bond of putmax0,X/(1+r)^(T-t)-S】。

若對應資產(股票指數)發放股利(股利殖利率為0.02)時,表示投資人投資股票指數現貨的成本,會因為在這一整段期間所收到的股利而減少將股利折現的部分。

投資股票指數選擇權買權的人,會因為發放股利,而除息後的股價指數,只剩下以股利殖利率折現股價指數的部分。

 

 

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