Commodity Markets and Futures › Limitations and Practical Considerations
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Commodity futures trading involves complexities that theoretical models often simplify or ignore. Understanding these limitations is essential for practitioners.
The cost of carry model assumes frictionless markets where storage can be arranged at any scale, physical delivery is straightforward, and arbitrage can be executed instantly. In reality, storage capacity is finite and concentrated among a limited number of firms. During periods of oversupply, such as the oil market collapse in early 2020, storage constraints can cause dramatic price dislocations. WTI crude oil futures briefly traded negative in April 2020 because the market faced a situation where physical delivery was required but storage was unavailable at any price.
Convenience yield, while conceptually elegant, cannot be directly observed or measured. It must be inferred from the difference between actual futures prices and what the pure cost of carry model predicts. This makes convenience yield somewhat circular in practice: we define it as whatever residual is needed to reconcile observed prices with theory. Convenience yield also varies with aggregate inventory, who holds the inventory, where it is located, and what the holder's specific needs are.
Liquidity in commodity futures markets is heavily concentrated in near-term contracts. While the front-month crude oil contract might trade millions of contracts daily, contracts with delivery dates two or three years out may trade only thousands. This creates challenges for hedgers seeking protection over longer horizons and can introduce execution costs and slippage that erode hedge effectiveness.
Physical delivery mechanics create operational risks. Most financial participants roll positions before expiration to avoid delivery, but miscalculations can lead to the obligation to accept or deliver physical commodities. The infrastructure, logistics, and documentation requirements for physical settlement are substantial, and many trading firms have learned expensive lessons by inadvertently holding positions into the delivery period.