Calendar-spread divergence as a demand clock for commodity reversals

Two prices for one commodity

The same commodity can print one price for prompt delivery and another for later delivery. That difference is the calendar-spread: a month-to-month reading of demand and carrying-charges, not a standalone outright bet.

Calendar spreads are the joint product of carrying-charges such as interest and storage and of relative demand. When those factors are relatively stable, the spread tracks near-horizon-demand versus longer-horizon anticipated demand.

When nearby demand dominates

In the 1990 Iraq-Kuwait crude-oil episode, nearer contracts were bid above farther contracts amid a feared short-term supply break. That pattern is term-structure-inversion: a short-horizon supply scare dominating longer-horizon pricing.

Editorial bound: financial and gold calendar spreads are treated as harder to read because they trade mainly on actual and expected interest-rate gaps, so this procedure stays with commodity markets where carrying-charges and relative demand can still be told apart.

Entry, exit, and sit-out as one procedure

The archive workflow specifies closing prices for the spread. Intra-session month-to-month differences can swing widely when not every contract month trades continuously. The working input is therefore the settlement-spread.

A TradersWeek editorial reading writes the rest as a single procedure. Sit out while the current contract and the calendar-spread still agree. Consider a reversal only when spread-price-divergence appears near a chart extreme: the outright and the month-to-month spread split. Stay with that reversal reading only while the demand clock keeps contradicting the stretched price structure. Return to sit-out if the two series realign or if the split fails to hold. The procedure fires on confirmation or contradiction, not on the outright extreme alone.

A directional split between the current contract and the month-to-month spread is presented as a possible early warning of reversal. It is described as helpful but not always reliable.

Historical alignments

In the July 1989 coffee case, a February-March double bottom in the outright lined up with a later-March higher low in the July-September spread, after which the market advanced.

In the 1989 copper case, a February lower low in the July contract occurred while the July-September spread held a flat base and a rally followed. A later April double top in the outright coincided with a weaker spread and a sharp decline.

Editorial note: the coffee episode and the first copper episode read as the demand clock supporting a turn off an outright extreme. The later copper episode reads as the clock contradicting a topped-out contract.