Calls and Puts, Side by Side

There are only two kinds of option. A call is about buying. A put is about selling. Every spread, every condor and every strategy with an odd name is just these two pieces in a different combination.

Reading two definitions side by side does not help much. Looking at one chart and flipping it does.

Why the chart is bent

Both lines have the same shape: a flat part and a sloped part, joined at the strike. The bend is there because an option is a right rather than a promise. Below its strike, a call is not worth using, so its value stops falling. Above the strike it is worth using, and from there it moves with the stock dollar for dollar.

That flat part is what you are buying. A stock position is a straight line: you gain and lose the same amount in both directions, forever. An option bends the line, and the premium is the price of the bend.

The max(0, …) is the bend. It is why an option can expire worthless but never worth less than nothing, and why a buyer cannot lose more than they paid.

Which one do you want, and when?

A call gains when the stock rises. A put gains when it falls. So far, so symmetrical. The difference is in how far each one can go.

A stock can rise without limit, so a long call has no ceiling on its profit. A stock can only fall to zero, so a long put tops out at the strike less what you paid. That sounds like a small distinction and turns into a large one later: it is why short calls carry unlimited risk and short puts do not.

The middle row is the one to sit with. At $100 both contracts expire worthless and both buyers lose everything they paid. Getting the direction right is not enough. You have to be right by more than the premium, and before the contract expires. That is why buying options is harder than it looks.

Breakeven is not the strike

A common early mistake is treating the strike as the point where the trade starts making money. It is not. The strike is where the contract starts having any value at all. Breakeven sits further out, by the amount of the premium.

Four positions, not two

Every contract has a buyer and a seller, so two contract types make four positions. They do not behave alike.

• Long call. Pays for uncapped upside, loses the premium if you are wrong.
• Short call. Collects premium, faces unlimited risk if the stock takes off. Only reasonable when you own the shares, which makes it a covered call.
• Long put. Pays for downside protection, or for a bearish bet.
• Short put. Collects premium, agrees to buy the stock if it falls. With the cash set aside, that is a cash-secured put.

The next lesson takes one contract and puts you on both sides of it, because the gap between buying and selling is where most of the risk sits.

What can go wrong

Buying a call because you are bullish, and losing anyway. The stock can rise and the call can still lose money if it does not clear the breakeven in time. At or below the strike it expires worthless. Between the strike and breakeven it has value, just less than you paid. Direction alone does not pay.

Selling a call without owning the shares. The chart looks tidy and the downside looks bounded. The upside branch has nothing under it. Do not open one casually.