Fight Finance

Question 793  option, hedging, delta hedging, gamma hedging, gamma, Black-Scholes-Merton option pricing

A bank buys 1000 European put options on a $10 non-dividend paying stock at a strike of $12. The bank wishes to hedge this exposure. The bank can trade the underlying stocks and European call options with a strike price of 7 on the same stock with the same maturity. Details of the call and put options are given in the table below. Each call and put option is on a single stock.

European Options on a Non-dividend Paying Stock
Description	Symbol	Put Values	Call Values
Spot price ($)	##S_0##	10	10
Strike price ($)	##K_T##	12	7
Risk free cont. comp. rate (pa)	##r##	0.05	0.05
Standard deviation of the stock's cont. comp. returns (pa)	##\sigma##	0.4	0.4
Option maturity (years)	##T##	1	1
Option price ($)	##p_0## or ##c_0##	2.495350486	3.601466138
##N[d_1]##	##\partial c/\partial S##		0.888138405
##N[d_2]##	##N[d_2]##		0.792946442
##-N[-d_1]##	##\partial p/\partial S##	-0.552034778
##N[-d_2]##	##N[-d_2]##	0.207053558
Gamma	##\Gamma = \partial^2 c/\partial S^2## or ##\partial^2 p/\partial S^2##	0.098885989	0.047577422
Theta	##\Theta = \partial c/\partial T## or ##\partial p/\partial T##	0.348152078	0.672379961

 

Which of the following statements is NOT correct?

(a) If the underlying stock price suddenly rose by $0.01, the put option price would be expected to fall by less than $0.00552034777953178.

(b) If the underlying stock price suddenly fell by $0.01, the put option price would be expected to rise by more than $0.00552034777953178.

(c) If the underlying stock price suddenly rose by $0.01, the call option price would be expected to rise by more than $0.00888138404936379.

(d) To Delta hedge the 1000 long put options, long 552.0348 stocks.

(e) To Delta and Gamma hedge the 1000 long put options, long 2078.4226 call options and short 2397.9617 stocks.

Question 794  option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the Delta of a European call option?

(a) ##N[d_1]##

(b) ##N[d_2]##

(c) ##−N[−d_1]##

(d) ##−N[−d_2]##

(e) ##N[−d_2]##

Where:

###d_1=\dfrac{\ln⁡[S_0/K]+(r+\sigma^2/2).T)}{\sigma.\sqrt{T}}### ###d_2=d_1-\sigma.\sqrt{T}=\dfrac{\ln⁡[S_0/K]+(r-\sigma^2/2).T)}{\sigma.\sqrt{T}}###

Question 795  option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the Delta of a European put option?

(a) ##N[d_1]##

(b) ##N[d_2]##

(c) ##−N[−d_1]##

(d) ##−N[−d_2]##

(e) ##N[−d_2]##

Question 796  option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the risk-neutral probability that a European call option will be exercised?

(a) ##N[d_1]##

(b) ##N[d_2]##

(c) ##−N[−d_1]##

(d) ##−N[−d_2]##

(e) ##N[−d_2]##

Question 797  option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the risk-neutral probability that a European put option will be exercised?

(a) ##N[d_1]##

(b) ##N[d_2]##

(c) ##−N[−d_1]##

(d) ##−N[−d_2]##

(e) ##N[−d_2]##

Question 832  option, Black-Scholes-Merton option pricing

A 12 month European-style call option with a strike price of $11 is written on a dividend paying stock currently trading at $10. The dividend is paid annually and the next dividend is expected to be $0.40, paid in 9 months. The risk-free interest rate is 5% pa continuously compounded and the standard deviation of the stock’s continuously compounded returns is 30 percentage points pa. The stock's continuously compounded returns are normally distributed. Using the Black-Scholes-Merton option valuation model, determine which of the following statements is NOT correct.

(a) ##d_1=-0.001033933##

(b) ##N[d_1]=0.447492432##

(c) ##d_2=-0.431999277 ##

(d) ##N[d_2]=0.332870969 ##

(e) ##c_0=0.81951217##

Question 834  option, delta, theta, gamma, standard deviation, Black-Scholes-Merton option pricing

Which of the following statements about an option (either a call or put) and its underlying stock is NOT correct?

European Call Option
on a non-dividend paying stock
Description	Symbol	Quantity
Spot price ($)	##S_0##	20
Strike price ($)	##K_T##	18
Risk free cont. comp. rate (pa)	##r##	0.05
Standard deviation of the stock's cont. comp. returns (pa)	##\sigma##	0.3
Option maturity (years)	##T##	1
Call option price ($)	##c_0##	3.939488
Delta	##\Delta = N[d_1]##	0.747891
##N[d_2]##	##N[d_2]##	0.643514
Gamma	##\Gamma##	0.053199
Theta ($/year)	##\Theta = \partial c / \partial T##	1.566433

 

(a) A one cent ($0.01) increase in the underlying stock price is expected to lead to a 0.747891 cent ($0.00747891) increase in the call option price.

(b) The (risk-neutral) probability of the call option maturing ‘in-the-money’ is 0.643514.

(c) A one cent ($0.01) increase in the underlying stock price is expected to lead to a 0.00053199 unit increase in the call option Delta.

(d) The underlying stocks’ standard deviation of returns per day is 0.015702718 assuming 365 days per year and zero auto-correlation.

(e) After one day, all other things remaining equal, the option price is expected to fall by $1.566433 assuming 365 days per year.

Question 865  option, Black-Scholes-Merton option pricing

A one year European-style call option has a strike price of $4.

The option's underlying stock currently trades at $5, pays no dividends and its standard deviation of continuously compounded returns is 47% pa.

The risk-free interest rate is 10% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

(a) $0.287263739

(b) $0.398141032

(c) $1.142227853

(d) $1.667914067

(e) $2.193600281

Question 866  option, Black-Scholes-Merton option pricing

A one year European-style put option has a strike price of $4.

The option's underlying stock currently trades at $5, pays no dividends and its standard deviation of continuously compounded returns is 47% pa.

The risk-free interest rate is 10% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The put option price now is:

(a) $1.550849674

(b) $0.982509295

(c) $0.666414943

(d) $0.287263739

(e) $0.055037262

Question 903  option, Black-Scholes-Merton option pricing, option on stock index

A six month European-style call option on the S&P500 stock index has a strike price of 2800 points.

The underlying S&P500 stock index currently trades at 2700 points, has a continuously compounded dividend yield of 2% pa and a standard deviation of continuously compounded returns of 25% pa.

The risk-free interest rate is 5% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

(a) 162.83 points

(b) 220.56 points

(c) 226.43 points

(d) 230.91 points

(e) 317.45 points

Question 904  option, Black-Scholes-Merton option pricing, option on future on stock index

A six month European-style call option on six month S&P500 index futures has a strike price of 2800 points.

The six month futures price on the S&P500 index is currently at 2740.805274 points. The futures underlie the call option.

The S&P500 stock index currently trades at 2700 points. The stock index underlies the futures. The stock index's standard deviation of continuously compounded returns is 25% pa.

The risk-free interest rate is 5% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

(a) 226.43 points

(b) 220.56 points

(c) 176.21 points

(d) 162.83 points

(e) 128.92 points

Question 956  option, Black-Scholes-Merton option pricing, delta hedging, hedging

A bank sells a European call option on a non-dividend paying stock and delta hedges on a daily basis. Below is the result of their hedging, with columns representing consecutive days. Assume that there are 365 days per year and interest is paid daily in arrears.

Delta Hedging a Short Call using Stocks and Debt
Description	Symbol	Days to maturity (T in days)
		60	59	58	57	56	55
Spot price ($)	S	10000	10125	9800	9675	10000	10000
Strike price ($)	K	10000	10000	10000	10000	10000	10000
Risk free cont. comp. rate (pa)	r	0.05	0.05	0.05	0.05	0.05	0.05
Standard deviation of the stock's cont. comp. returns (pa)	σ	0.4	0.4	0.4	0.4	0.4	0.4
Option maturity (years)	T	0.164384	0.161644	0.158904	0.156164	0.153425	0.150685
Delta	N[d1] = dc/dS	0.552416	0.582351	0.501138	0.467885	0.550649	0.550197
Probability that S > K at maturity in risk neutral world	N[d2]	0.487871	0.51878	0.437781	0.405685	0.488282	0.488387
Call option price ($)	c	685.391158	750.26411	567.990995	501.487157	660.982878	?
Stock investment value ($)	N[d1]*S	5524.164129	5896.301781	4911.152036	4526.788065	5506.488143	?
Borrowing which partly funds stock investment ($)	N[d2]*K/e^(r*T)	4838.772971	5146.037671	4343.161041	4025.300909	4845.505265	?
Interest expense from borrowing paid in arrears ($)	r*N[d2]*K/e^(r*T)		0.662891	0.704985	0.594994	0.551449	?
Gain on stock ($)	N[d1]*(SNew - SOld)		69.052052	-189.264008	-62.642245	152.062648	?
Gain on short call option ($)	-1*(cNew - cOld)		-64.872952	182.273114	66.503839	-159.495721	?
Net gain ($)	Gains - InterestExpense		3.516209	-7.695878	3.266599	-7.984522	?
Gamma	Γ = d^2c/dS^2	0.000244	0.00024	0.000255	0.00026	0.000253	0.000255
Theta	θ = dc/dT	2196.873429	2227.881353	2182.174706	2151.539751	2266.589184	2285.1895

 

In the last column when there are 55 days left to maturity there are missing values. Which of the following statements about those missing values is NOT correct?

(a) The call option price is expected to be $654.757851.

(b) The stock investment value used for hedging should be $5506.488143, partly funded by $4845.505265 in debt.

(c) The interest expense on the borrowing from the previous day will be $0.663813.

(d) The gain on the stock is zero and the gain on the short call option is $6.225027.

(e) The net gain is $5.561214.

Question 1003  Black-Scholes-Merton option pricing, log-normal distribution, return distribution, hedge fund, risk, financial distress

A hedge fund issued zero coupon bonds with a combined $1 billion face value due to be paid in 3 years. The promised yield to maturity is currently 6% pa given as a continuously compounded return (or log gross discrete return, ##LGDR=\ln[P_T/P_0] \div T##).

The hedge fund owns stock assets worth $1.1 billion now which are expected to have a 10% pa arithmetic average log gross discrete return ##(\text{AALGDR} = \sum\limits_{t=1}^T{\left( \ln[P_t/P_{t-1}] \right)} \div T)## and 30pp pa standard deviation (SDLGDR) in the future.

Analyse the hedge fund using the Merton model of corporate equity as an option on the firm's assets.

The risk free government bond yield to maturity is currently 5% pa given as a continuously compounded return or LGDR.

Which of the below statements is NOT correct? All figures are rounded to the sixth decimal place.

(a) The zero coupon bond liabilities are currently priced at $0.835270 billion.

(b) If the hedge fund were to immediately liquidate all shares and repay all bond liabilities, it would have $0.264730 billion of assets now.

(c) The hedge fund's current market capitalisation of equity would be worth $0.341971 billion.

(d) The probability that the hedge fund's share assets are worth less than its liabilities when the bond matures is 58.406040% in a risk-neutral world where all assets earn the risk free rate.

(e) The probability that the hedge fund's share assets are worth less than its liabilities when the bond matures is 22.339580% in the risk-averse world where investors earn the higher returns on stocks for bearing risk.