How Commodity Prices Are Determined: Supply, Demand, and Market Forces

At the most basic level, commodity prices are determined by the balance between global supply and demand. When a drought reduces Brazil's soybean harvest, reduced supply pushes prices higher. When Chinese construction activity slows, reduced demand for iron ore and copper pushes prices lower. These fundamental drivers account for the majority of long-term price trends.

However, supply and demand in commodity markets are rarely simple. Supply can be disrupted by weather, geopolitical conflicts, infrastructure failures, and government export restrictions. Demand is influenced by economic growth, technological change, seasonal patterns, and policy decisions like emissions targets or infrastructure stimulus packages.

Commodity futures exchanges — such as CME, ICE, and LME — provide standardized contracts for future delivery that serve as global price benchmarks. While these markets were originally created to allow producers and consumers to hedge price risk, they now attract significant participation from financial speculators, index funds, and algorithmic traders.

Speculative activity can amplify price movements beyond what fundamentals would justify. During periods of high market uncertainty, speculative positioning can drive short-term price spikes or crashes. However, academic research generally shows that speculation improves market liquidity and price discovery over the medium to long term.

Geopolitical events have outsized impacts on commodity prices because physical supply chains are geographically concentrated. Russia's invasion of Ukraine disrupted global wheat, sunflower oil, and natural gas markets. OPEC production decisions directly influence crude oil prices. Export bans by major producers — such as Indonesia's periodic palm oil export restrictions — create sudden supply shocks.

Government subsidies, tariffs, and strategic reserves also influence commodity prices. China's strategic stockpiling of copper, crude oil, and grains can absorb significant supply from the market, supporting prices even when commercial demand weakens.

Since most internationally traded commodities are priced in US dollars, the strength of the dollar relative to other currencies directly affects commodity prices. A stronger dollar makes commodities more expensive for non-US buyers, dampening demand and pushing prices lower. Conversely, a weaker dollar typically supports higher commodity prices.

Freight costs, port congestion, and regional supply-demand imbalances create price differentials between markets. The same grade of iron ore might trade at different prices in Rotterdam, Qingdao, and Tubarao due to shipping costs, local demand conditions, and regional quality preferences.