THE LEXICON · TERM STRUCTURE
Term structure
Term structure is the shape of the VIX curve across maturities: what volatility costs at nine days against what it costs at six months, and everything between. The shape has a name — contango or backwardation.
The curve, point by point
Volatility is not a single number. It is a price with a horizon attached. Each point on the curve is an implied volatility for a different distance out, and each is quoted in annualized terms so the four can be laid side by side and compared. Plot them left to right and the line has a slope. That slope is the term structure. What the desk reads here is read off the shape, not off any one point.
The four horizons on the panel are nine days, thirty days, three months and six months. The front point sits close enough to now that it moves with the day's flow. The back point sits far enough out that it moves slowly. The gap between them is the whole of the shape, and it is where the reading happens.
Why contango is usual
In contango the line rises to the right. Longer-dated volatility costs more than near-dated, which is the market paying up to sleep at night. The far horizon holds more that has not happened yet, and whoever writes insurance across it wants compensation for carrying the unknown. This is the usual state, and usual is the important word. A curve doing what it normally does is background. It becomes information only when it stops.
What inversion is, and is not
In backwardation the front rises above the back. Demand for protection now outbids demand for protection later and the curve inverts. That is what stress looks like on a curve. It is a record of what is being paid, not a forecast of what follows, and the distinction is the entire discipline. The curve reports a price. Prices describe positioning and appetite. They do not describe outcomes.
The shift between the two matters more than either state. A curve that inverted this morning and one that has been inverted for a week are not the same object, even at identical levels. The first is a change in what the market will pay. The second is a condition already carried. Reading only the label on the panel collapses those two into one word.
How the desk reads it
The panel names the regime and shows the four points, so the read is two questions. Which state, and did it change. Nothing beyond that comes off the curve on its own. It carries no direction. It says nothing about which way the index goes and nothing about when. Every point on it is an index calculation resting on a model of the option chain beneath it, which is why the assumptions belong on the panel rather than in a footnote.
Beside skew and the expected move it describes one day from three angles: what protection costs across time, what it costs across strikes and how large a move the market paid for. None of the three predicts. Together they establish the conditions a session is being traded in, which is a smaller claim and a more honest one.
How it gets misread
The common error is treating the state as a signal. Backwardation gets read as a bottom and contango as an all-clear, which turns a description of what protection costs into a directional call it cannot carry. The second error is conflating this curve with the VIX futures curve. These four points are index calculations across fixed horizons, not tradable contracts, and the futures curve can sit in a different shape at the same moment.
Where it lives
Term structure sits beside the other prices this options market sets, and reads best in company.
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