Seasonal commodity spreads as portfolio slots

Slots instead of favorite charts

Editorial view: treat a seasonal intermarket spread as a bookkeeping slot, not as a favorite chart. A slot is complete only when it names one calendar window, one contract-month pair, and one hold-or-quit rule for open-equity-drawdown.

The archive's stated end use was to identify and quantify many seasonal spread trades so they could be assembled as a diversified book rather than one favorite pairing.

Four lenses, one calendar search

Commodity spreads were described as historically studied through four lenses: fundamentals, technical tools, historical trading-range and ratio analysis, and seasonality.

Seasonality was used as a search for relationships that tend to appear at the same time of year across repeated years. Seasonal-trading is a signal procedure that opens and closes a defined window because a relationship has tended to appear at the same time of year.

Seasonality-analysis is a market-regime read of whether an intermarket relationship still clusters by calendar after later years, new competition, and newer contracts are included.

Average lines hide the worst path

Week-to-week reliability displays were said not to equal reliability over a multi-week holding window. Average seasonal lines can hide the worst excursion and be skewed by one extreme year.

A contra-seasonal-move is a path that leaves the usual calendar tendency and must be judged by worst excursion, not by the average seasonal line. Open-equity-drawdown is the worst mark-to-market retreat while a window is open, used to decide how long a slot can be held before it is abandoned.

Units, months, and missing complexes

Unlike-contract-units require reconciling different weights, face amounts, or metal sizes before two legs can be compared in dollars. The archive noted livestock weights, interest-rate face amounts, and metal contract sizes, and it noted that newer complexes such as energies and stock indices were missing from older seasonal catalogs.

Contract-month-selection compares several delivery months of the same two markets so the pair most likely to show the windowed relationship can be chosen.

Spread-leg-order as the quoting rule

The worked format always lists the long leg first and the short leg second so the spread value is first minus second and a rising plot matches a profitable path. That is spread-leg-order: a quoting convention that buys the first listed contract and sells the second.

Wheat versus soybeans in one window

The case study inspected long December Chicago Board of Trade wheat versus short November soybeans from August 15 to October 22 across 17 years from 1970 through 1986, and also compared other wheat and soybean contract months for the same idea.

Path diagnostics reported for that window included worst single-year loss, worst drawdown, average drawdown, and a 2,500-dollar stop described as 50 cents, marking the example as a volatile slot.

The search processed more than 3,000 spreads, and the same mid-August to late-October grain-soybean read was described as usable for outright long wheat and short soybean positioning.

A book of many slots

Commodity-spread-trading keeps the two legs as one position with shared entry, exit, and abstention rules. Seasonal-trading names the window. Seasonality-analysis asks whether the calendar cluster still belongs in the book after later years and newer contracts are considered.

Editorial view: write each relationship as a slot that can be held or quit on its own, so no single pairing is asked to carry the book.