Simple question about options


Not exactly.

"Why We Have Never Used the Black-Scholes-Merton Option Pricing Formula"

Authors: Espen Gaarder Haug, Nassim Nicholas Taleb
https://www.researchgate.net/public...e_Black-Scholes-Merton_Option_Pricing_Formula

https://nassimtaleb.org/2022/02/black-scholes-equation/

A somewhat imprecise but better answer would be "supply and demand, with market makers picking up the slack."
 
who determines options prices and how they change as the underlying stock price changes? just curious.
Everybody has his/her own opinion about what the price should be.
If seller and buyer agree upon on the price then a trade occurs.
Ie. supply and demand determines the price.
Implied volatility (IV) tells the same, in the language of maths.

Just play with an options calculator: https://optioncreator.com/options-calculator
And read the details of the Black-Scholes-Merton option pricing model at wikipedia.
Better yet buy a textbook for beginners interested in options.
 
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Not exactly.

"Why We Have Never Used the Black-Scholes-Merton Option Pricing Formula"

Authors: Espen Gaarder Haug, Nassim Nicholas Taleb
https://www.researchgate.net/public...e_Black-Scholes-Merton_Option_Pricing_Formula

https://nassimtaleb.org/2022/02/black-scholes-equation/

A somewhat imprecise but better answer would be "supply and demand, with market makers picking up the slack."

maybe few participants submit their bid/ask price without black scholes calculation, but by and large , cobe uses such modified model. I did a calc back in the days, only variations can be explained by different borrowing costs and volatility numbers, which are tailored to each participant. you can submit a wild spread but may not get filled.
 
maybe few participants submit their bid/ask price without black scholes calculation, but by and large , cobe uses such modified model. I did a calc back in the days, only variations can be explained by different borrowing costs and volatility numbers, which are tailored to each participant. you can submit a wild spread but may not get filled.

Really? Where did those "volatility numbers" come from?

Tip: vol is backed out of the BSM (or whatever model you're using.) The formula can't give you a price without a vol figure; if you think it does, imagine a brand-new ticker and tell me how you're going to price it without any buyer/seller input. Or how the BSM will deal with buyers piling into a strike and progressively lifting the bid because there are no sellers.
 
Really? Where did those "volatility numbers" come from?

Tip: vol is backed out of the BSM (or whatever model you're using.) The formula can't give you a price without a vol figure; if you think it does, imagine a brand-new ticker and tell me how you're going to price it without any buyer/seller input. Or how the BSM will deal with buyers piling into a strike and progressively lifting the bid because there are no sellers.

Jump-diffusion model for short term volatility calc, but of course prop firm can always improve the data and submit a spread, or to make market.
 
Jump-diffusion model for short term volatility calc, but of course prop firm can always improve the data and submit a spread, or to make market.

Right... so, not BSM. Pretty much what I said.

From Investopedia:

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