🗊Презентация Chapter 17. Options markets: introduction

CHAPTER 17 Options Markets: Introduction (44 slides)

Options Derivatives are securities that get their value from the price of other securities. Derivatives are contingent claims because their payoffs depend on the value of other securities. Options are traded both on organized exchanges and OTC. Chinese currency option next page

Chinese Currency options

The Option Contract: Calls A call option gives its holder the right to buy an asset: example next page At the exercise or strike price On or before the expiration date Exercise the option to buy the underlying asset if market value > strike.

Option quotation

Warrants in Hong Kong Warrant Terms and Indicators Warrant Name South Africa A Goldman thirty-two Publisher Goldman Sachs Related assets South A50 Warrant Price (HKD) 0.040 Change (%) 8.11 Warrant Type Ordinary Warrant Exercise price 10.80 Underlying Price 9.49 Turnover ($) 600 Call / Put Subscription ITM / OTM (%) 13.8% (OTM) Maturity (Year - Month - Day) 2013-12-30 Last Trading Date (Year - Month - Day) 2013-12-19 Maturity 67 Conversion Ratio 1 Lot Size 2,000 Technical information Gearing (x) 237.25 Premium% (break-even price) 14.23% (10.840) Effective Gearing (x) 22.87 Implied Volatility 22.08 Over the past 30 days Underlying Historical Volatility Not applicable Delta 9.64 Outstanding Ratio% 30.40% Time loss value -4.02 Technical information

The Chinese Warrants Bubble, by Wei Xiong et al. In 2005-2008, over a dozen put warrants traded in China went so deep out of the money that they were almost certain to expire worthless. Nonetheless, each warrant was traded more than three times each day at substantially inflated prices. This bubble is unique in that the underlying stock prices make warrant fundamentals publicly observable and that warrants have predetermined finite maturities. This sample allows us to examine a set of bubble theories. In particular, our analysis highlights the joint effects of short-sales constraints and heterogeneous beliefs in driving bubbles and confirms several key findings of the experimental bubble literature. (JEL G12, G13, O16, P34)

The Option Contract: Puts A put option gives its holder the right to sell an asset: At the exercise or strike price On or before the expiration date Exercise the option to sell the underlying asset if market value < strike.

The Option Contract The purchase price of the option is called the premium. Sellers (writers) of options receive premium income. If holder exercises the option, the option writer must make (call) or take (put) delivery of the underlying asset.

Example 17.1 Profit and Loss on a Call A January 2010 call on IBM with an exercise price of $130 was selling on December 2, 2009, for $2.18. The option expires on the third Friday of the month, or January 15, 2010. If IBM remains below $130, the call will expire worthless.

Example 17.1 Profit and Loss on a Call Suppose IBM sells for $132 on the expiration date. Option value = stock price-exercise price $132- $130= $2 Profit = Final value – Original investment $2.00 - $2.18 = -$0.18 Option will be exercised to offset loss of premium. Call will not be strictly profitable unless IBM’s price exceeds $132.18 (strike + premium) by expiration.

Example 17.2 Profit and Loss on a Put Consider a January 2010 put on IBM with an exercise price of $130, selling on December 2, 2009, for $4.79. Option holder can sell a share of IBM for $130 at any time until January 15. If IBM goes above $130, the put is worthless.

Example 17.2 Profit and Loss on a Put Suppose IBM’s price at expiration is $123. Value at expiration = exercise price – stock price: $130 - $123 = $7 Investor’s profit: $7.00 - $4.79 = $2.21 Holding period return = 46.1% over 44 days!

Market and Exercise Price Relationships In the Money - exercise of the option would be profitable Call: exercise price < market price Put: exercise price > market price Out of the Money - exercise of the option would not be profitable Call: market price < exercise price. Put: market price > exercise price. At the Money - exercise price and asset price are equal

American vs. European Options American - the option can be exercised at any time before expiration or maturity European - the option can only be exercised on the expiration or maturity date In the U.S., most options are American style, except for currency and stock index options.

Different Types of Options Stock Options Index Options Futures Options Foreign Currency Options (e.g. Chinese Currency options) Interest Rate Options

Payoffs and Profits at Expiration - Calls Notation Stock Price = ST Exercise Price = X Payoff to Call Holder (ST - X) if ST >X 0 if ST < X Profit to Call Holder Payoff - Purchase Price

Payoffs and Profits at Expiration - Calls Payoff to Call Writer - (ST - X) if ST >X 0 if ST < X Profit to Call Writer Payoff + Premium

Figure 17.2 Payoff and Profit to Call Option at Expiration

Figure 17.3 Payoff and Profit to Call Writers at Expiration

Payoffs and Profits at Expiration - Puts Payoffs to Put Holder 0 if ST > X (X - ST) if ST < X Profit to Put Holder Payoff - Premium

Payoffs and Profits at Expiration – Puts Payoffs to Put Writer 0 if ST > X -(X - ST) if ST < X Profits to Put Writer Payoff + Premium

Figure 17.4 Payoff and Profit to Put Option at Expiration

Option versus Stock Investments Could a call option strategy be preferable to a direct stock purchase? Suppose you think a stock, currently selling for $100, will appreciate. A 6-month call costs $10 (contract size is 100 shares). You have $10,000 to invest.

Option versus Stock Investments Strategy A: Invest entirely in stock. Buy 100 shares, each selling for $100. Strategy B: Invest entirely in at-the-money call options. Buy 1,000 calls, each selling for $10. (This would require 10 contracts, each for 100 shares.) Strategy C: Purchase 100 call options for $1,000. Invest your remaining $9,000 in 6-month T-bills, to earn 3% interest. The bills will be worth $9,270 at expiration.

Option versus Stock Investment

Strategy Payoffs

Figure 17.5 Rate of Return to Three Strategies

Strategy Conclusions Figure 17.5 shows that the all-option portfolio, B, responds more than proportionately to changes in stock value; it is levered. Portfolio C, T-bills plus calls, shows the insurance value of options. C ‘s T-bill position cannot be worth less than $9270. Some return potential is sacrificed to limit downside risk.

Protective Put Conclusions Puts can be used as insurance against stock price declines. Protective puts lock in a minimum portfolio value. The cost of the insurance is the put premium. Options can be used for risk management, not just for speculation.

Covered Calls Purchase stock and write calls against it. Call writer gives up any stock value above X in return for the initial premium. If you planned to sell the stock when the price rises above X anyway, the call imposes “sell discipline.”

Table 17.2 Value of a Covered Call Position at Expiration

Figure 17.8 Value of a Covered Call Position at Expiration

Straddle Long straddle: Buy call and put with same exercise price and maturity. The straddle is a bet on volatility. To make a profit, the change in stock price must exceed the cost of both options. You need a strong change in stock price in either direction. The writer of a straddle is betting the stock price will not change much.

Table 17.3 Value of a Straddle Position at Option Expiration

Figure 17.9 Value of a Straddle at Expiration

Spreads A spread is a combination of two or more calls (or two or more puts) on the same stock with differing exercise prices or times to maturity.

Table 17.4 Value of a Bullish Spread Position at Expiration

Figure 17.10 Value of a Bullish Spread Position at Expiration

Collars A collar is an options strategy that brackets the value of a portfolio between two bounds. Limit downside risk by selling upside potential. Buy a protective put to limit downside risk of a position. Fund put purchase by writing a covered call. Net outlay for options is approximately zero.

Put-Call Parity The call-plus-bond portfolio (on left) must cost the same as the stock-plus-put portfolio (on right):

Put Call Parity - Disequilibrium Example Stock Price = 110 Call Price = 17 Put Price = 5 Risk Free = 5% Maturity = 1 yr X = 105 117 > 115 Since the leveraged equity is less expensive, acquire the low cost alternative and sell the high cost alternative

Table 17.5 Arbitrage Strategy

Option-like Securities Callable Bonds Convertible Securities Warrants Collateralized Loans