What Moves Commodity Prices? Supply, Demand, Inventories & Key Drivers

By now, you know what commodity contracts are, how futures and options work and how much capital those positions can require. But none of that tells you whether Gold, Crude Oil or Copper should actually go up or down.

For that, you have to look underneath the contract.

A commodity price is ultimately connected to a real market. Crude Oil is being produced and consumed, Copper is being mined and used by industry, crops are being grown and harvested, while Gold is affected by both physical demand and financial conditions.

That is why very different developments can move different commodities. A drought can affect crop production, an OPEC decision can change the outlook for Crude Oil supply, while an interest-rate decision can matter much more to Gold.

The starting point is usually the same: what has changed in supply, demand or expectations around that commodity?

At the centre of a commodity market is the balance between how much of something is available and how much buyers want.

If demand strengthens while supply struggles to keep up, prices can come under upward pressure. If production is strong while demand weakens, the opposite can happen.

The complication is that neither side necessarily changes quickly.

A mine cannot suddenly double Copper production because prices have risen. A farmer cannot produce another crop next week because supply is tight, while bringing new oil production online can also take time.

That can make commodity prices particularly sensitive when something changes unexpectedly.

Markets also react before the physical change necessarily arrives. If traders begin expecting oil supply to tighten three months from now, Crude Oil can respond today. If economic data starts pointing towards weaker industrial activity, Copper may begin moving before the slowdown is fully visible in actual consumption.

So the market is constantly weighing both what supply and demand look like now and what they may look like next.

There may already be large quantities of a commodity sitting in storage. Those inventories can act as a buffer when supply and demand suddenly move out of balance.

Suppose a temporary disruption reduces Crude Oil supply. If inventories are high, existing stocks can help cover some of the shortage. If inventories are already low, there is much less room to absorb the same disruption.

That is why inventory data is important in markets such as Crude Oil, Natural Gas, metals and several agricultural commodities. Rising stocks can suggest that supply is running ahead of current demand, while falling stocks can indicate that inventories are being drawn down.

Neither automatically tells you where price will go, but inventories help show whether the physical market has plenty of cushion or very little.

Some commodities are closely tied to economic activity.

When factories are producing more, construction is expanding and transport activity is rising, demand for commodities such as Copper, Aluminium and Crude Oil can increase. A slowdown can weaken that demand.

Copper is particularly sensitive to this because it is used heavily across construction, electrical equipment, manufacturing and infrastructure. Changes in the outlook for economic and industrial activity can therefore quickly become part of the Copper price.

Gold works somewhat differently.

Interest rates can affect the relative appeal of holding an asset that does not itself pay interest. Inflation expectations can influence demand too, particularly when investors are concerned about purchasing power or wider financial conditions.

The US dollar also matters because many major global commodities are priced internationally in dollars. A stronger or weaker dollar can therefore affect their cost for buyers using other currencies.

None of these relationships works mechanically. Higher interest rates do not guarantee that Gold falls, just as a stronger dollar does not mean every commodity must decline. Another force may simply matter more at the time.

Central banks add another layer to Gold because they themselves hold the metal as part of their reserves. Changes in central-bank buying or selling can therefore become part of Gold's demand picture.

Commodity supply exists in the physical world, which means physical disruptions can reach the market quickly.

A mine can shut down, an oil field can lose production, a pipeline can be damaged, workers can strike or a crop can fail. Any of these can reduce the amount of a commodity expected to reach the market.

Wars and geopolitics matter for the same reason. What matters is not simply that there is a conflict somewhere. The market wants to know whether it threatens production, trade or transportation.

A conflict near a major oil-producing region, for example, becomes relevant to Crude Oil if production, exports or important shipping routes are at risk.

Crude Oil also has another major supply driver: OPEC and OPEC+.

Production decisions by major oil-producing countries can change expectations around how much oil will be available. A production cut may tighten the supply outlook, while an increase can ease it.

But the decision still has to be read alongside demand and inventories. A production cut when demand is strong and stocks are already low can have a very different impact from the same cut when demand is weak and inventories are comfortable.

Weather becomes especially important in agricultural commodities because it can directly affect how much crop eventually reaches the market.

Rainfall, temperature, drought, flooding and other conditions can affect planting, crop health, yields and harvesting. If expected production changes, prices can respond before the final harvest numbers are known.

This also gives many agricultural commodities a seasonal rhythm. Planting, growing and harvesting happen at particular times of the year, so the supply picture changes as the crop moves through that cycle.

Natural Gas has its own seasonal behaviour. Heating and cooling demand can change with weather, while inventories are built and drawn down through different parts of the year.

Seasonality does not mean a commodity must repeat the same price pattern every year. It simply means that the time of year can change the supply-demand conditions around the market.

The framework remains the same, but the forces that matter most can change dramatically from one commodity to another.

For Gold, traders may pay particular attention to interest rates, the US dollar, inflation expectations, periods of financial or geopolitical uncertainty and central-bank activity.

For Crude Oil, global demand, production, OPEC and OPEC+ policy, inventories and supply disruptions sit much closer to the centre of the analysis.

Natural Gas is particularly sensitive to weather, inventories, production and seasonal demand.

For Copper, economic growth and industrial activity are major demand drivers, while mine production, disruptions and inventories matter on the supply side.

Agricultural commodities bring yet another combination, where weather, crop output, inventories, seasonality and domestic or export demand can become much more important.

That is why the same development can affect two commodities very differently. An economic slowdown may weaken demand for Copper and Crude Oil while affecting Gold through an entirely different set of financial expectations.

Suppose OPEC announces a production cut. Knowing that alone is not enough.

How large is the cut? Was it already expected? Are inventories high or low? What is happening to demand? Could production rise somewhere else?

The same thinking applies elsewhere.

A drought matters because it can change crop production. A slowdown matters because it can change demand. An interest-rate decision matters because it can change financial conditions. A war matters when it affects supply, trade, transportation or uncertainty.

So rather than stopping at “this news is bullish” or “this news is bearish”, trace what the development actually changes for the commodity you are looking at.

Once the global commodity price moves, however, an Indian trader still has another question to answer: how does that international move become the price you see on your screen?

That takes us to Chapter 10: From Global Price To Indian Price.

• Commodity prices are ultimately connected to supply, demand and expectations about how that balance may change.
• Inventories act as a buffer between supply and demand, so the same disruption can have a very different impact depending on how much stock is already available.
• Economic growth, interest rates, inflation and the US dollar can influence commodity markets, but their importance varies from one commodity to another.
• Production disruptions, geopolitics, OPEC decisions, weather and seasonality can change the supply-demand picture.
• Different commodities have different dominant drivers, so a development needs to be understood in the context of the specific market it affects.