OF Options Force

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Options Basics

Options Basics

This section establishes the vocabulary and mechanics that every later chapter assumes you already own: what calls and puts actually are, the difference between owning a right and carrying an obligation, how a contract is specified, how to read moneyness and decompose an option's price, how to draw the four basic payoffs, and what happens at exercise and assignment. It closes by setting up the structural reason this curriculum teaches options primarily from the seller's side — the bias the rest of the material is built on.

Everything here is foundational options theory, but wherever a source states a definition, a rule of thumb, or a research result in its own words, that source is tagged inline.

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1. Calls and Puts; Long and Short; Rights vs. Obligations

An option is a contract between two parties referencing 100 shares of an underlying. There are only two contract types and only two sides, which combine into the four basic positions that everything else is built from.

The critical asymmetry is between the two sides of the same contract:

Combining type and side gives the four positions and their directional bias:

The buyer's loss is capped at the premium; the buyer's upside (on a call) is theoretically unbounded. The seller's profit is capped at the premium collected; the seller's risk on a naked call is theoretically unbounded, and on a naked put is bounded only by the stock going to zero. This payoff asymmetry — limited reward, large risk for the seller — is precisely why sellers must be compensated, and it is the hinge for the seller-bias discussion in Section 6.

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2. Contract Specification

Four parameters fully specify a standard U.S. equity option.

Multiplier in practice: the 100× factor flows through everything, including the Greeks. Many platforms display Theta on the options chain "as a total dollar amount by considering the options multiplier of 100 shares per contract," so the figure you see is already the whole-contract dollar impact.

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3. Moneyness and the Two Components of Price

Moneyness (ITM / ATM / OTM)

Moneyness describes where the strike sits relative to the underlying price.

OTM options "have no intrinsic value" and "will be worthless if they remain OTM through expiration." ATM strikes — those closest to the stock price — carry the most extrinsic value.

Intrinsic vs. Extrinsic (time) value

Premium decomposes into two parts:

Worked example. Stock at \$105, a \$100 call trading for \$7. Intrinsic = \$105 − \$100 = \$5. Extrinsic = \$7 − \$5 = \$2. At expiration the \$2 extrinsic has fully decayed and the option is worth only its \$5 intrinsic value (if the stock is unchanged).

The daily erosion of extrinsic value is Theta — "the one-day rate of decline of an option's extrinsic or time value." Theta only affects extrinsic value, never intrinsic. Long options carry negative Theta (decay works against the buyer); short options carry positive Theta (decay works for the seller). This single fact is the engine of the seller's edge.

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4. Payoff Diagrams and Breakeven

At expiration, extrinsic value is zero, so each position's value is purely intrinsic and the payoff is piecewise-linear. The breakeven is the underlying price at which P/L crosses zero.

The four basic payoff diagrams at expiration (P/L on the vertical axis, underlying price on the horizontal; `K` = strike, `BE` = breakeven, the dotted line is zero P/L):

The same information in tabular form:

Two structural points the diagrams make visible:

1. The long and short of the same contract are mirror images across the horizontal axis — one party's gain is the other's loss (a zero-sum transfer, before fees).

2. Selling premium pushes the breakeven away from the current price. A short put's breakeven sits below the strike by the credit received; the stock can fall to that level and the seller still does not lose. That cushion is the geometric basis of the probability-of-profit argument in Section 6.

Example — short put. Sell the \$50 put for \$2.00. Credit = \$200. Breakeven = \$50 − \$2 = \$48. Max profit \$200 (stock ≥ \$50 at expiration); the position only loses below \$48; max loss \$4,800 if the stock goes to \$0.

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5. Exercise, Assignment, and Style

American vs. European

"Most options are American style options that can be exercised at any time, but some options are European style and those can only be exercised at expiration."

In practice: U.S. equity and ETF options are American style (early assignment is possible); major cash-settled index options such as SPX are typically European style (no early assignment, cash settlement).

Early-assignment risk

Early assignment is a real but rare event, and it is driven by the short option's extrinsic value. A rational long holder rarely exercises early, because exercising throws away any remaining extrinsic value — it is usually better to sell the option. Two situations make early assignment likely:

1. The short ITM option's extrinsic value has nearly vanished (deep ITM, near expiration), so the long holder gives up almost nothing by exercising.

2. A pending dividend exceeds the extrinsic value left in a short ITM call. When the dividend to be captured is larger than the call's remaining extrinsic value, long holders exercise early to capture it — the classic dividend-risk scenario for short calls.

Because of point (1), the standard guidance is to sell the option to capture both intrinsic and extrinsic value rather than exercise it yourself — exercising forfeits the extrinsic value you could otherwise have sold.

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6. The Seller Bias the Curriculum Is Built On

The house approach this curriculum teaches is to be a net seller of options premium. Three pillars support this, and they recur throughout the rest of the material.

Pillar 1 — Implied volatility is structurally overstated. Research finds that implied volatility tends to overstate the move the underlying actually realizes — i.e., options are, on average, priced "too expensive," which hands the seller a statistical edge. A well-known backtest on overstatement in low IV rank illustrates that the expected (1-SD) move exceeded the realized move across thousands of occurrences. Practitioner summaries of the broader study describe testing SPX/NDX/RUT from 2005 onward (~6,500 occurrences, 45-day windows).

Pillar 2 — Selling raises probability of profit. "Probability of profit (POP) refers to the chance of making at least \$0.01 on a trade." A premium seller can profit if the stock rises, stays flat, or even moves against the position "just a bit" — the collected credit "can be used as a buffer against losses … which grants us an even higher probability of success." Because breakeven is directly tied to POP, and selling premium improves the breakeven, sellers can consistently push POP above the ~50% of a pure long.

Pillar 3 — Time is on the seller's side (positive Theta). Short options decay in the seller's favor; the seller can buy them back below the sale price or let them expire worthless.

When to lean in: IV Rank. Premium sellers gauge whether premium is rich using IV Rank (IVR) — how current IV compares to the underlying's last 52 weeks of data — treating IVR above 50% as elevated and 80+ as extreme. The general rule: "short options/volatility trades become relatively more attractive when IV rank is above 50%, whereas long options/volatility trades become relatively more attractive when IV rank is below 50%."

Managing the position. Because the seller's max profit is the credit, the systematic approach emphasizes managing winners early rather than holding to expiration; many platforms even provide a "Close at Profit Percent" order keyed to a percentage of max profit, reflecting the house practice of taking profits (commonly cited around the 50% level) instead of squeezing the last decay.

Stated limitation / conflict. The seller bias is not a claim that selling is risk-free. The payoff table in Section 1 makes the trade-off explicit: sellers accept capped reward and (on naked positions) large or unlimited risk in exchange for a higher win rate and positive Theta. Later sections temper the naked-selling picture with defined-risk structures (spreads), small position sizing, and occurrences/number-of-trades so the statistical edge can actually play out — the raw edge does not survive oversized, mismanaged positions.

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Key Takeaways

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Common Misconceptions

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Review Questions

1. You buy a \$100 call for \$4 with the stock at \$102. How much of the premium is intrinsic, how much is extrinsic, and what is your breakeven at expiration? (Intrinsic \$2; extrinsic \$2; breakeven \$104.)

2. Which side of an option contract holds a right, and which holds an obligation? What does each pay or receive at the open?

3. A short \$50 put is sold for \$1.50. What is the breakeven, the max profit, and the theoretical max loss?

4. Name the two conditions under which early assignment on a short option becomes likely, and explain why a rational long holder rarely exercises early otherwise.

5. State the three structural reasons for favoring premium selling, and the IV Rank threshold above which short-premium trades become "relatively more attractive."

6. Why are an option's long and short payoff diagrams mirror images, and what does that imply about who pays for the seller's positive Theta?

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Sources

_Evidence-labeled per the Project Charter. Education only, not financial advice._