Commodity ETC / ETP

Commodity exchange-traded products let you buy oil, gold or a commodity basket like a share. Under the hood they come in two fundamentally different builds — and knowing which one you hold is most of the game:

• Physically backed (mainly precious metals): the product owns bars in a vault. Your return ≈ the metal's price minus a small fee. Clean.
• Futures-based (oil, gas, broad baskets — anything you can't vault cheaply): the product holds futures and rolls them forever. Your return = spot moves plus or minus the roll — which can diverge from the headline commodity spectacularly.

The cautionary tale every investor should know: in 2020, oil ETP buyers watched oil "recover" while their product didn't — contango roll costs had quietly consumed the rebound. Some natural-gas products have lost >95% over a decade of mostly sideways gas.

Legal wrappers (Europe vs. US)

• ETC (Europe): a debt security collateralised by metal or futures — UCITS funds can't hold single commodities, so the note format is the workaround; check collateralisation.
• US: grantor trusts (gold), commodity pools (futures — K-1 tax forms!), and ETNs (pure issuer credit — Lehman ETN holders became creditors).

Reading a futures-based product

• Roll methodology: front-month (max spot fidelity, max roll pain), optimised/dynamic rolls, or laddered maturities.
• Collateral yield: cash backing the futures earns T-bill rates — a real part of returns (large when rates are high).
• Total return components: spot + roll + collateral = your actual return. Prospectuses show them; almost nobody reads them.

Leveraged and inverse variants

Daily-reset 2x/3x products compound path-dependently: in choppy markets they bleed regardless of direction ("volatility drag") — trading tools, not investments, and the graveyard of many retail accounts.

Return decomposition, formally

Roll yield is the curve's slope harvested at each roll; over long horizons it dominates spot for most energy products (the excess-return vs. spot-index gap in every index factsheet).

Creation/redemption and the 2020 stress test

AP arbitrage pins price to NAV as with ETFs — until it can't: USO in April 2020 halted creations, traded at premium, then restructured its roll under regulatory position limits mid-crisis, crystallising tracking break. For physical gold ETCs the redemption mechanism reaches vaulted bars: their premium/discount is a metal-market stress readout.

Product-design frontier

• Optimised roll indices (e.g. picking curve points by momentum/carry rules) — systematic strategies in ETP form; evaluate as such (backtest inflation-hedged? capacity?).
• Carbon (EUA) ETCs: futures-based on emission allowances — policy risk as an asset class.
• Collateralised vs. ETN credit: post-2008 migration to secured structures; residual issuer risk lives in swap-enhanced products.

Due-diligence checklist (quant edition)

Wrapper legal claim → collateral chain → roll schedule → position-limit exposure → tax treatment → TER + spread. Only then the market view.

The formulas above are standard textbook formulations, simplified for teaching. They explain the mechanism — they are not a valuation tool, and they will not reproduce a dealer’s price.