Questions tagged [american-options]

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5
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1answer
149 views

Why aren't american put options martingales?

I don't understand what's wrong in the following argument. Assume that we have a no-arbitrage market where the following products are traded: a risky asset $S$, a risk-free bond $B$, an American put ...
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0answers
35 views

Expected life (Fugit) of American Option

How can I use the binomial tree pricing method for American options to determine the expected time of exercise for the option (or "Fugit")? In particular, how would I modify the algirithm ...
0
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1answer
52 views

Volatility input for American options

I have to price an american option on a daily basis and I have some questions regarding the CRR binomial tree model: Is it correct to use implied volatility as an input? Or is it better to use ...
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0answers
28 views

Deterministic optimal call time

Consider a American Option on a linear payoff i.e., if called at time $T$, it pays off $S(T)$, the stock price. Is the optimal call time of such an option determinsitc? Is there an intuition to the ...
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0answers
47 views

Deriving American option greeks

I am using integral representation of option value instead of trees, so I imagine to derive greeks we have to integrate across time for the boundary to get the EEP (Early Exercise Premium) component ...
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0answers
80 views

Option implied data from CME

I am trying to extract the risk free rate and volatility from the traded American options with expiry Nov-2020 from CME. https://www.cmegroup.com/trading/metals/...
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0answers
74 views

Option that never expires

I have been struggling with the problem below for quite some time now. I really don't know how to approach it. All I could think of is to use the Black-Scholes formula with $T \rightarrow \infty$, ...
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0answers
51 views

Early exercise premium with discrete cash dividends using integral approximation

From my understanding, we have to integrate $N(d1(S_x-D,B,t))$ on both asset-price and time-space to derive the Early Exercise Premium $EEP(B,t)$ on each $t$ before the ex-date to get current early ...
0
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1answer
48 views

Can a down-and-out barrier call option be priced using the Black & Scholes formula or should it be approximated?

I am trying to price of a Down-and-Out Barrier call option with leverage. When the price of the underlying asset hits a certain barrier (B), the option becomes worthless. The issuer of these options ...
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0answers
36 views

The wider bid-ask spread of in-the-forward American option

Why is the bid-ask spread of a in-the-forward/money American call (put) much larger than the out-of-the-forward/money American put (call)? I suppose the answer to the same corresponding question ...
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1answer
83 views

Option data analysis

This question is regarding the following tweet: https://twitter.com/yuriymatso/status/1281730109141954561 How was the original tweeter able to know that "Someone made a ...
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0answers
31 views

Early exercise boundary for american call and discrete cash dividend boundary approximation

I am attempting to derive early exercise boundaries for American calls paying both continuous and fixed discrete dividends using the combination method from integral equations. I have successfully ...
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0answers
45 views

Confusion about American style option

In American style exotic options, the holder is often faced with choices at certain times during the life span of the option. Following the/an optimal choice allows the user to maximize the value of ...
3
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1answer
221 views

Converting an American option to European option [closed]

I wonder if there are any websites/resources/sample codes/papers on how to convert the American options to European options (when all else are equal). i.e. if given same underlying asset, same ...
0
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1answer
53 views

Convexity of a rates Bermudan w.r.t strike

Recently there was a nice question asked on convexity of American put w.r.t strike: Convexity of an American put option Does the same hold for a Bermudan option in rates, where they underlyings are ...
0
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1answer
71 views

Under what conditions will both European and American put options worth the same?

It is well-known that on a non-dividend paying stock, it is suboptimal to exercise an American call option earlier. In other words, both European and American call options on the same non-dividend ...
0
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1answer
64 views

Inequality involving Co-Terminal/Co-Initial American vs Bermudan Swaptions

Let us consider a payment schedule $\mathcal{P}:=\{t_1,\dots,t_n\}$ which has a corresponding fixing schedule $\mathcal{F}:=\{t_0,\dots,t_{n-1}\}$. We have a series of co-terminal and co-initial swaps ...
4
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1answer
101 views

Estimating optimal exercise boundary for an American call by LSM method

I'm trying to derive optimal exercise boundary using LSM method and got some weird outcome. So, I evaluated an American call option by LSM method and now need to find the optimal exercise curve. Do I ...
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0answers
16 views

What does it mean to change the initial average value to asset an asian-american option?

I am currently trying to replicate the Longstaff (2001) paper where he explained the least-squared approach to value American options. In section 4, he explained how to apply this method to asset a ...
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3answers
524 views

Convexity of an American put option

Is the price of an American put on an underlying without dividend convex with respect to the strike?
2
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1answer
52 views

Far OTM calculation issue on Bjerksund-Stensland

Has anyone come across and fixed calculation issues on boundaries using Bjerksund-Stensland 2002 (Hull, Haug or Rouah implementations) ? Thanks in advance
3
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0answers
95 views

Boundary condition in perpetual american option problem

I am trying to solve the perpetual American option problem. Currently I'm following this (slide 9). The stock price is modelled as Ito's process. $dS_t = (\mu-D_0)S_tdt\ +\ \sigma S_tdW_t $ where $...
0
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1answer
59 views

Arbitrage between American and European put options on the same underlying asset

Suppose there exist both American-style and European-style put options on the same underlying asset, at the same strike price, and with the same expiry date. Suppose the European put is selling below ...
3
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1answer
143 views

Implied vol and model calibration for an american option on a dividend paying stock - is there a market standard pricing model?

In terms of calibrating a pricing model to observed prices for American options on a dividend paying stock, is there a standard way of doing this in practice? My initial thought was to use CRR ...
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0answers
35 views

Does the price of an American Put often exceed the Payoff?

According to shreve the value of a put is equivalent to or greater than the possible payoff, before a stopping time with the condition that its value equals the intrinsic value. First what does it ...
0
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1answer
29 views

Reference for “an increase in volatility increases value/price of american options”

I'm looking for a textbook/journal article reference for the well-known result that an increase in volatility increases the value/price of a standard American (call and put) option. In the case of ...
0
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0answers
77 views

delta of synthetic forward of american options

For european options, we know the delta of a synthetic forward position (long call short put with the same strikes and maturities) because of the put-call parity. However the P-C parity does not apply ...
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0answers
23 views

How to calculate strike price for an American put given its value at time 0 and the binomial tree of stock prices?

Given the interest rate, prices of the stock at time 0,1,2 where T=2 is the expiry date, and the value of the American put at time 0, how do I calculate its strike price? The question gives it the ...
0
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1answer
54 views

Create a Synthetic Single Stock Future

Is it possible to create a synthetic long single stock future using the stock and it's vanilla options with the caveat that selling naked puts is NOT allowed? That is, you can write puts, but they ...
1
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1answer
63 views

Are there values of the strike price for which an American put and European put have the same no-arbitrage price?

Assuming the options do not pay dividends, is there a strike price that satisfies this?
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0answers
43 views

American put option reference price that is accurate to at least 6 digits?

I need an accurate reference price of an American put option under GBM dynamics ($r > 0$). I can use many numerical methods, but it would take too long to get any more than 3 or 4 digits of ...
3
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1answer
217 views

Is gamma always positive for American call/put options under Black-Scholes framework?

Most reference I could find only consider European options, but I would like to know whether this also holds for American options in general (with continuous dividend yield and/or discrete dividends)?
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0answers
50 views

Relation between volatility and exercise timing of American Options

Hopefully someone can help me with intuition. Suppose that we have a stock whose value evolves per the geometric brownian motion $dX_t=X_t\mu dt+X_t\sigma dW_t$, for $\sigma>0$, $\mu\in\mathbb{R}$ ...
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1answer
88 views

Why do we care about American options?

I have been told most real options are American. However, this isn't really true. Markets are closed at times, there are delays in transactions, or the owner of the option might be sleeping, or just ...
1
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1answer
101 views

L2 Assumptions of the Longstaff Schwartz method

In page 121 of the original LS Paper they use the fact that the space of functions they are dealing with (payoffs of American options), belong to the $\mathcal L^2$ space. They use this assumption ...
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0answers
47 views

Optimized search for yield-to-worst of a callable bond

Suppose that I need to find the yield-to-worst of a callable bond, and that the option is American (call any time). The bond may have step-up coupons and/or non-constant call price (oprion strike). ...
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0answers
73 views

Short-Term Option Contract Worth Same as Long Term Option Contract At Same Strike?

Let's say that I'm analyzing option contracts for ABC Company, which typically trades at lower volumes. While researching ABC Company, I notice that for a given strike price, contracts that expire in ...
3
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1answer
1k views

Why the focus on American put options in literature?

I've noticed that in the literature, whenever European vanilla options are to be priced, the classical approach is to price a European call. I guess it doesn't matter because we have put-call parity. ...
0
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1answer
181 views

Is Longstaff-Schwartz best method for Bermudan options?

What is the go-to method for pricing of Bermudan/American options? I've heard the Longstaff-Schwartz method is really popular. Is it better than the other methods generally speaking? If not, which ...
2
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2answers
83 views

Lower bound for Bermudan Option Price

i have the following question. The price of an Bermudan option is given by \begin{align*} V_{0} = \sup_{\tau \in \mathcal{T}(0,\dots, T)} \mathbb{E}[f_{\tau}(X_{\tau})]. \end{align*} It is ...
0
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1answer
63 views

Is it possible to use options to increase the yield of a dividend paying stock?

I was wondering if it is possible to use call options (selling call options) to increase the yield of a dividend-paying stock (that I already own) by 1-2 percent per year? What are the cons of this ...
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0answers
78 views

American options & Optimal Stopping Time

From Shreve's book (Stochastic Calculus for Finance II), assuming stock dynamic as standard GBM (without any dividends), the discounted American put price process (which is a super-martingale), ...
2
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0answers
140 views

Pricing American Options by Neural Networks

Has anyone read the paper 'Pricing of High-Dimensional American Options by Neural Networks' by M. Kohler et al. (2010) and tried to program the proposed method in Python? I have been trying that for ...
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0answers
35 views

What is the effect of put call open Interest on price action

how option put call open Interest affects price actions as put sellers feel price when price goes down or call sellers feel pain when price goes up and how this affects price action. ie when price ...
1
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2answers
410 views

Price American call equal to price European call (non-dividend-paying stock)

Let $\tilde{C}_K(t,T)$ be the value (price) of an American call option at strike $K$ and maturity $T$, and $C_K(t,T)$ the value (price) of a European call option at same parameters. For a non-...
4
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0answers
53 views

Are radial basis functions popular in least squares monte carlo option pricing?

In a Longstaff-Schwarz setting option on several underlyings can be priced using least squares monte carlo. Using suitable set of basis functions, continuation values can be approximated using ...
2
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0answers
70 views

Interchange Expectation and Supremum in Snell Envelope/American Options

I had a question about the properties of a snell envelope, $\sup_{t\le\tau\le T} \Bbb E\left(Z_\tau\mid \mathcal F_t\right)$, which came to me while studying American options. I know that in general,...
0
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1answer
192 views

On pricing american put options

How come we pick the highest between the discounted weighted average (with risk neutral probabilities) and the early exercise value at each node of the binomial tree? I dont understand why, I can ...
2
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1answer
244 views

Do Perpetual American Options have closed form functions to compute the Greeks?

I was wondering if there were analytical formulas to compute delta or gamma for perpetual American options?
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0answers
71 views

Why does an American option on a continuous dividend paying stock have a critical price above which it is optimal to exercise early?

An American call on a continuous dividend paying stock must be above its intrinsic value, i.e $c(t)\geq\max(S_t-K,0)$. Why is there a critical price above which it is optimal to exercise (i.e. we ...

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