What Is an Option?

A simple mental model: the car you put a deposit on

Your neighbour is selling their car for 9,000. You want it, but you cannot decide until Saturday. So you hand them 200 to hold the car for you until Saturday at 9,000. That 200 is gone either way, whatever you decide.

Everything an option specifies is already on the table:

• The premium is the 200: the price of the right.
• The strike is the 9,000: the agreed purchase price.
• The expiration is Saturday: the deadline.
• You may buy, you do not have to. Your neighbour must sell if you decide to go ahead.

Now comes the part an ordinary reservation does not have. On Thursday someone offers your neighbour 10,000. They are not allowed to sell, because your right stands. That makes your claim itself worth something: a third party would pay you for the right to buy at 9,000 in your place. You can profit without ever owning the car.

If nobody is willing to pay more than 9,000, you let Saturday pass. Your 200 is lost. Your neighbour keeps both the car and the 200 — which they earned by staying tied to the agreement for a week.

The comparison has a limit: an option’s price moves continuously, with the price of the underlying, the time remaining and the expected volatility.

An option is a contract with four fixed terms

The technical terms now have a place. The contract states which underlying it covers, the price at which the right can be exercised, when that right ends, and whether the right is to buy or sell.

The four terms work together:

The contract does not tell you whether the position is a good idea. It tells you exactly which rights, obligations and deadlines you are trading.

Calls and puts divide the rights and obligations

The buyer of a call option has the right to buy the underlying at the strike. If that right is exercised, the seller must meet the contract’s delivery or settlement obligation.

The buyer of a put option has the right to sell the underlying at the strike. If that right is exercised, the seller must take the other side of the contract. Turn the picture above around: instead of securing the right to acquire something at a fixed price, you secure the right to hand it over at a fixed price — much like an insurance policy with a fixed payout and a fixed term.

The important distinction is simple: “the right, but not the obligation” belongs to the buyer. The seller receives the premium and keeps the obligation until the position is closed, expires or is assigned.

What does an option cost?

The price of an option is its premium. A standard US equity option commonly covers 100 shares. That is common, not universal. Corporate actions and other option products can have a different contract multiplier.

A quote of 2.40 with a multiplier of 100 therefore means:

2.40 × 100 = 240

The buyer pays 240 currency units before fees. The seller receives the same gross amount but accepts the contractual obligation. The premium is not automatically profit for the seller.

Worked example: a call with a 50 strike

Assume a fictional stock trades at 50. A call with a 50 strike and a chosen expiration costs 2.40 per share. The multiplier is 100.

• Buyer’s cost: 240 before fees and tax.
• Stock at 56 at expiration: The call has 6 of intrinsic value per share, or 600 per contract.
• Result at expiration: 600 of intrinsic value minus the 240 premium equals 360 before fees and tax.
• Stock at 49 at expiration: The call has no intrinsic value. The buyer loses the 240 premium paid.

This separates two numbers that are often mixed together. The right is worth 600 at expiration, but the trade did not earn 600. The premium paid belongs in the calculation.

This example describes value at expiration. Before expiration, time remaining and implied volatility also affect the option’s market price.

Does the buyer have to exercise?

No. A buyer can exercise the right, sell the option in the market before expiration, or let it expire. Which route is available or practical depends on the contract, liquidity, broker and circumstances.

The seller’s obligation does not end because they expect the option to expire. A short option can normally be closed with an offsetting purchase as long as it has not already been assigned.

What an option does not automatically mean

• Lower cash outlay does not mean low risk. A purchased option can lose its entire premium.
• Premium collected is not guaranteed income. It comes with an obligation.
• One hundred shares is not a universal multiplier. Check the specification of the exact contract.
• American and European describe exercise style, not geography. American-style options can generally be exercised before expiration; European-style options can be exercised only at expiration.
• A correct direction is not always enough. Premium, time and volatility affect the result.

Feynman check: explain it without trading jargon

Explain an option to someone in two sentences. Do not use the words derivative, leverage, bullish or bearish.

Your explanation is complete when it answers four questions:

1. What may be bought or sold?
2. Which price has been agreed?
3. How long does the right last?
4. Who may choose, and who must act when the right is used?

One plain-language answer is: “An option is an agreement with a fixed price and a deadline. The buyer chooses whether to use the agreed right; the seller must take the other side if that happens.”

If you reverse the buyer and seller while explaining it, you have found the gap. Return to the section on rights and obligations before moving on.

Five questions to answer before choosing a strategy

1. What is the underlying and contract multiplier?
2. Is the contract a call or a put?
3. Am I buying the right or selling the obligation?
4. What are the strike and expiration date?
5. What can exercise, assignment or cash settlement put into the account?

Once those five answers are clear, continue with calls, puts, long and short. That framework makes every strategy profile easier to read.