What is contango and backwardation?

Contango and backwardation describe the shape of the commodity futures curve relative to the spot price. In contango, futures prices are progressively higher than the spot price: the front-month contract trades at a premium to spot, and more distant contracts trade at even higher premiums. In backwardation, futures trade below the spot price, with more distant contracts priced lower still.

Contango is the "normal" state for many commodities because it reflects the cost of carry: storage costs, insurance, and financing charges that must be incurred to hold a physical commodity over time. A gold producer can store gold at a cost of roughly 0.5% per year, so gold futures typically trade at a slight premium to spot reflecting these carrying costs. Oil contango can become extreme when storage capacity fills up, as occurred in April 2020 when WTI front-month futures briefly traded negative because holders had no storage available for physical delivery.

Backwardation signals that near-term supply is tighter than long-term supply. When spot prices exceed futures prices, the market is offering a premium for immediate delivery, indicating that current inventories are insufficient to meet demand. Oil market backwardation is typically associated with OPEC supply cuts, geopolitical disruptions, or strong demand growth. Gold backwardation is rare and signals extreme physical demand relative to available supply.

For investors in commodity ETFs or futures-based strategies, the curve shape has a direct impact on returns. In contango, rolling from expiring front-month contracts into more expensive next-month contracts creates "negative roll yield" that erodes returns even if the spot price is flat. In backwardation, the roll is positive because the investor sells the expensive spot and buys the cheaper future. This roll yield dynamic explains why commodity ETFs like USO can significantly underperform the spot oil price over time, particularly during extended contango periods.