A five-minute chart of a single index call is open on the screen, with a neat rising trendline drawn under it. Through the afternoon the index does almost nothing — it finishes within a few points of where it started — and the trendline breaks anyway, decisively, on what looks like a clean breakdown. Somebody reads that as the market turning. It is not the market turning. It is a series that loses value every hour the world stands still, drawn as though it were a price that only moves when somebody changes their mind.
A resale ticket to a match three weeks away carries a price built out of several things at once: how likely the match is to matter by then, how many people still want to go, and how long there is left to decide. As the day approaches, the part of the price that was pure possibility drains away. On the morning of the match the ticket is worth what the match is worth and nothing more. A graph of that ticket’s price over three weeks is not a graph of the teams.
An option premium is that ticket. What you are charting is possibility with a deadline attached, and the deadline is doing something to the line every single hour, whether or not anything happens.
Four inputs, one line
A premium is made of intrinsic value — how far the option is in the money, which is a matter of the strike price against the underlying — and everything else, which is the value of the time and uncertainty remaining. Four things move that price and they need not move together: the underlying, the time remaining, the volatility the market expects, and — weakly, over longer horizons — interest rates and any dividend before expiry. Flatten four inputs into one line and identical-looking chart shapes can be produced by opposite events.
| What the premium chart shows | Cause A | Cause B |
|---|---|---|
| A steady drift downwards through a quiet session | Sellers pressing, which is what it would mean on a stock chart | Time decay, which does exactly this to an out-of-the-money option in a market that is not moving. No participant did anything |
| A sharp fall with the underlying unchanged | A large seller in that strike | A volatility crush after a scheduled event, where the expectation the premium was pricing has resolved and the uncertainty component collapses |
| A vertical spike upward | Genuine demand for that strike | A single trade in an illiquid far strike, printing far from the resting quotes. The wick is one transaction, not a range |
| A break of a rising trendline | A change in direction | A change in moneyness — the underlying has drifted and the option is now further from the money, so the same underlying move produces a smaller premium response than it did an hour ago |
The series has no past and no future
The other structural problem is that there is nothing to hold a long chart of. A given strike in a given expiry is a distinct contract with a start date — the day the exchange introduced that strike, which happens as the underlying moves and new strikes become relevant — and an end date at expiry. There is no history before it existed. The same strike number in the next expiry is a different instrument with different time remaining, different liquidity and, usually, a different moneyness.
- Any lookback indicator is being fed a built-in drift. A series that loses value simply because time passes carries a downward tendency that owes nothing to buyers and sellers, so part of what a moving average or an oscillator reports on it is the decay rather than the market.
- Mean reversion has no meaning. There is no mean for the premium to revert to: the fair value of the series is itself falling towards intrinsic value as expiry approaches.
- Support and resistance have no memory. The levels a stock respects come from participants who transacted there and remember it. Nobody has a view about ₹43 of premium; they have a view about the index.
- The available contracts change by rule. Which expiries and strikes are listed at any time is set by the exchanges and the regulator, and that set has been revised more than once. A backtest that assumes a particular menu of contracts is testing a market that may no longer exist in that form.
- Costs are a large fraction of the number. On a far strike the bid-ask spread can be a meaningful share of the premium itself, so the line on the chart is not a price you can transact at in either direction.
What to look at instead
- 1Chart the underlying, and let the option be the expression
The structural view — trend, level, invalidation, target — belongs on the index or the stock, where there is an order book, a continuous history and participants with memory. The option is then a decision about how to express that view, at what cost and over what horizon.
- 2Read implied volatility as its own series
Where the premium has a built-in drift, the volatility implied by option prices does not decay simply because time passes. It has a history, a normal range for that underlying and an observable pattern around scheduled events, and it is a far more legitimate thing to plot than the premium.
- 3Read open interest and its change alongside price
Open interest is a count of outstanding positions rather than a price, so it does not decay. The open interest lesson in the applying-it module covers what it can and cannot support — the point here is only that it is a series with a stable meaning.
- 4If you must look at the premium, look at it as a cost
The useful questions about a premium line are “what does this position cost”, “how much of that is time value that will be gone by my horizon” and “how wide is the spread against the mid” — execution questions. Not “where is the trendline”.
- 5Convert every option idea back into an underlying level
Write down the level in the underlying at which the idea is wrong, before the position is opened. That level exists on a chart you can legitimately read, and it survives decay, a volatility collapse and the option becoming illiquid.
The trendline on the premium chart has broken
You are long an out-of-the-money index call, three sessions from expiry. The premium chart has broken a rising trendline on the five-minute. The index itself is inside the same range it has held all afternoon.
An out-of-the-money option loses 29% of its premium across a flat afternoon two sessions before expiry. What is the most accurate reading?
Module checkpoint: charts that are not stocks
5 questions. Answers are revealed once you submit all of them.
1.Two platforms draw a continuous crude chart using the same adjustment method, and the candles still differ. What is the most likely reason?
2.Open interest on an MCX contract has been rising for a fortnight. What does that tell you about the commodity?
3.USDINR rises 1%. What have you learned?
4.Why does an index have no volume of its own?
5.You are right about the direction of the index into a scheduled event, and the call option you hold still loses value. What happened?
Teen hafte baad ke match ka ticket black mein bik raha hai. Uske daam mein match ka maza kam, "abhi kuch bhi ho sakta hai" zyada hai — aur woh wala hissa har din apne aap kam hota jaata hai. Match ke din ticket sirf match ke barabar bacha. Option ke premium pe trendline kheenchna usi ticket ka graph banana hai. Bazaar hila hi nahi, phir bhi line tooti — kyunki do ghante beet gaye. Chart underlying ka dekho; option sirf usko kehne ka tareeka hai.
- A premium chart collapses the underlying, time, expected volatility and moneyness into one line.
- Decay produces a falling chart in a flat market, so a breakdown and a quiet afternoon look identical.
- A strike in an expiry is a contract with a start date and an end date — there is no long history to read.
- Implied volatility and open interest are series with stable meanings; the premium line is not.
- Put the structural view on the underlying and write down the level at which the idea is wrong.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.