Options: Calls, Puts and the Anatomy of a Premium

An option buys something different from a stock: not the stock itself, but the right to buy or sell it at a set price. That one-sentence difference produces an entirely different mathematics of risk — and this piece exists to show that math, not to recommend using it.

The Four Seats

Every option trade has two sides, which makes four possible positions:

The asymmetry the table describes: the buyer's loss is capped but likely; the seller's gain is capped but likely. The two sides are trading different things — the buyer pays a small, certain cost for a large, low-probability payoff.

The Two Parts of the Premium

An option's price is called the premium, and it has two components:

Intrinsic value — what the right would be worth if exercised today. With the stock at $110, a $100 call has $10 of intrinsic value.

Time value — everything else. It is the price of the possibility that the stock moves your way before expiry.

Time Decay

Time value shrinks every day, and the shrinking accelerates as expiry approaches. This is theta. In practice it means: an option buyer is betting not only on direction but against the calendar. Being right isn't enough; you must be right before expiry, faster than the time value melts.

Options expiring the same day (0DTE) are the extreme of this decay: within hours they either multiply or go to zero. In recent years most of the volume has migrated to these contracts — the financial product that most resembles a lottery ticket.

The Volatility Premium

The main input that sets the size of time value is the volatility the market expects from the stock — implied volatility. If the market expects big moves, premiums inflate; if it expects calm, they deflate. More: What Is Volatility?

This Is Leverage

The appeal of options is big exposure for small money: a $3 premium exposes you to the movement of a $100 stock. That is leverage by definition — even though it never appears labeled "leverage" in your account. Every warning in the leverage piece applies here, with one difference: in a margin account the loss arrives as a margin call; in options it arrives as the premium burning to zero. For buyers, a 100% loss is not a tail scenario — it is a common outcome.

The Seller's Side

Collecting premium looks like steady income: most months, options expire worthless and the seller keeps the money. The problem is the distribution — gains are small and frequent, losses are rare and enormous. Selling uncovered calls carries the same unlimited-loss profile as a short position. In these strategies, "it made money every month for years" usually means "that month hasn't arrived yet."

Where You'll See It on This Site

There is no options chain on this site, and nothing can be traded here. But one output of the options market is on screen every day: the VIX fear index is derived from S&P 500 option prices and reads out the volatility the market expects over the next 30 days. You'll find it on the Markets screen.