The commodity field guide

Read a futures curve as a dated cross-section

Compare delivery months, quote units and observation times before interpreting a curve’s shape.

Build a carrying-cost comparison with explicit units

Separate financing, storage and insurance in a simple physical-carry diagnostic.

Separate a futures roll from the return earned through time

Trace contract replacement, subsequent price changes and collateral without treating a spread as immediate profit or loss.

Handle zero and negative commodity prices without broken ratios

Use absolute differences and explicit domains when prices cross zero.

Interpret commercial crude stocks within their reporting boundary

Separate commercial inventories, strategic reserves and flow measures before discussing a crude-oil balance.

Distinguish working gas, base gas and storage deliverability

Interpret natural-gas inventory volumes without treating them as capacity or immediately deliverable supply.

Reconcile stock changes before calling them physical flows

Track additions, withdrawals and classification changes in an explicit inventory bridge.

Preserve the release vintage behind an inventory claim

Separate observation dates, publication dates and retrieval dates in historical commodity studies.

Compare calendar months without confusing observation weights

Reproduce monthly inventory means and an equal-weight five-year reference, with explicit completeness rules.

Read gas injection and withdrawal seasons as tendencies

Compare seasonal starting levels, net changes and regional conditions without treating calendar boundaries as physical switches.

Align grain balances to their marketing years

Translate crop-year labels into periods and avoid mixing old-crop, new-crop and calendar-year evidence.

Describe commodity seasonality without promising a forecast

Use historical monthly comparisons as context while preserving uncertainty, structural change and vintage limits.

Calculate corn stocks-to-use from a dated balance sheet

Use consistent ending stocks, total use and marketing-year vintages before interpreting the ratio.

Decompose a crop forecast revision before interpreting it

Trace acreage, yield, supply and use changes while preserving each report’s information date.

Interpret an energy balance residual as a reconciliation item

Keep measured components, transfers and unresolved differences separate in petroleum accounting.

Convert commodity units without losing physical meaning

Distinguish volume, mass, energy and quoted contract units in reproducible calculations.

Build a contract calendar before interpreting commodity exposure

Track delivery, notice and trading dates separately from research observation dates and roll assumptions.

Separate futures notional, margin and research capital

Use explicit denominators when explaining futures exposure, variation margin and collateral returns.

Check commodity data rights at the dataset and output level

Distinguish government statistics, private contributions, exchange documentation and licensed market feeds.