NISM-Series-XV: Research Analyst · Fundamental Analysis of Commodities

Demand and Supply Drivers in Commodity Price Analysis

Updated 11 October 2026 · Fact-checked

Commodity prices move when supply and demand shift. You study production, consumption, opening and closing stocks, and import-export flows. The stocks-to-use ratio (closing stocks ÷ total use) shows how much buffer exists. A low ratio means a tight market and higher or more volatile prices; a high ratio means ample supply and weaker prices.

Understand Demand and Supply Drivers in Commodities

A commodity is a standardised, interchangeable product such as wheat, crude oil or copper. Buyers cannot easily tell one producer's lot from another's, so price is set mainly by the balance between supply and demand. Fundamental analysis of commodities starts with that balance.

Supply for a period = opening stocks + production + imports. Demand (use) = domestic consumption + exports. Whatever is not used stays as closing stocks (ending stocks), which become the opening stocks of the next period. This is often called the balance sheet of a commodity.

Prices react to changes at the margin. A short crop, a mine strike or an OPEC-style output cut reduces supply. Higher income, population growth, a new industrial use or a biofuel mandate raises demand. In the short run, supply and demand are both slow to respond to price. So a small imbalance can cause a large price move. This is why commodity prices are volatile.

Inventories act as a shock absorber. When stocks are large, a supply shortfall is met from stock and prices move little. When stocks are thin, the same shortfall pushes prices up sharply. The stocks-to-use ratio captures this: it expresses closing stocks as a share of total use (domestic consumption plus exports). Analysts compare it with its own history for that commodity, not across different commodities.

Global trade flows link local markets. Exporting countries, importing countries, freight costs, export duties, import tariffs and exchange rates decide where a commodity goes and at what price. For a country like India, which imports crude oil, edible oils and pulses, a weaker rupee or an export ban abroad raises domestic prices even when local demand is unchanged.

Key formulas to remember

Total supply: Total supply = Opening stocks + Production + Imports; Supply available in the period, before any use.
Total demand (use): Total use = Domestic consumption + Exports; This total is the denominator of the stocks-to-use ratio.
Closing stocks: Closing stocks = Total supply − Total use; Positive means a surplus carried forward; a fall in stocks means use exceeded new supply.
Stocks-to-use ratio: Stocks-to-use ratio = Closing stocks ÷ Total use × 100; Total use = domestic consumption + exports. Expressed as a percentage. Lower means tighter market and upward price pressure; higher means comfortable supply.
Price direction rule: Supply ↓ or Demand ↑ → price ↑; Supply ↑ or Demand ↓ → price ↓; Holds when other factors are unchanged (ceteris paribus).

How to solve Demand and Supply Drivers in Commodities questions

Use this order for any question on demand-supply drivers of a commodity.

1Identify the commodity and the period or scenario in the question.
2Separate the event into a supply factor (production, imports, stocks) or a demand factor (consumption, exports, new uses).
3Decide the direction of the shift: does supply fall or rise, does demand fall or rise?
4If numbers are given, build the balance: supply = opening stocks + production + imports; use = consumption + exports; closing stocks = supply − use.
5Compute stocks-to-use = closing stocks ÷ use × 100 and compare it with the other figure or year given.
6Conclude: lower stocks-to-use means tighter market and price support; higher means surplus and price pressure.
7Check for trade or currency effects (duties, bans, rupee movement) that change domestic price differently from global price.

Quickest way: Direction first, then ratio

When to use it: Use when the question asks which scenario is bullish or bearish for price, or which year had the tightest market.

Mark each event as supply up, supply down, demand up or demand down.
Supply down and demand up are bullish; supply up and demand down are bearish.
For tightness questions, compute closing stocks ÷ total use (consumption + exports) only for the options in question. The lowest ratio is the tightest.
Eliminate options that reverse the direction rule or use the wrong denominator, such as production or consumption alone.

Common mistakes in Demand and Supply Drivers in Commodities

Dividing closing stocks by production instead of total use.
Production is the number most often quoted in news, so students reach for it.
Fix: The ratio is closing stocks ÷ total use (consumption + exports). Write the formula before you calculate.
Treating a rise in stocks as always bullish for price.
Students confuse 'more stock' with 'more demand'.
Fix: Higher stocks mean more supply cushion, which is bearish for price, other things equal.
Forgetting opening stocks and imports when building supply.
Students count only current production.
Fix: Always add opening stocks, production and imports to get total supply.
Counting exports as supply instead of demand.
Exports sound like output.
Fix: Exports leave the domestic market, so they are part of use. Imports add to supply.
Comparing stocks-to-use ratios across different commodities.
A figure like 15% looks comparable anywhere.
Fix: Compare a commodity's ratio with its own history or other seasons. What is tight for one commodity may be normal for another.
Ignoring the rupee and trade policy when judging domestic prices.
Students focus only on physical balance.
Fix: For imported goods, a weaker rupee or higher import duty raises domestic price. An export ban lowers domestic price and raises global price.

Worked examples

Example 1

For a commodity, opening stocks are 20 lakh tonnes, production is 100 lakh tonnes and imports are 10 lakh tonnes. Consumption is 105 lakh tonnes and exports are 5 lakh tonnes. What is the stocks-to-use ratio, using total use as the denominator?

Show the solution

Total supply = 20 + 100 + 10 = 130 lakh tonnes.
Total use = 105 + 5 = 110 lakh tonnes.
Closing stocks = 130 − 110 = 20 lakh tonnes.
Stocks-to-use = 20 ÷ 110 × 100 = 18.18%.

Answer: About 18.2%

Example 2

Year 1 has closing stocks of 30 lakh tonnes and use of 200 lakh tonnes. Year 2 has closing stocks of 18 lakh tonnes and use of 200 lakh tonnes. Which year is tighter and what is the likely price implication for Year 2 compared with Year 1?

Show the solution

Year 1 ratio = 30 ÷ 200 × 100 = 15%.
Year 2 ratio = 18 ÷ 200 × 100 = 9%.
Year 2 has the lower ratio, so less buffer relative to use.
A tighter market makes prices more sensitive to shocks and tends to support higher prices.

Answer: Year 2 is tighter (9% against 15%), so prices are likely to be higher or more volatile than in Year 1, other things equal.

Exam tips

Memorise the denominator: stocks-to-use uses total use (consumption + exports), not production.
Questions often give a balance sheet and ask for closing stocks first. Do that step explicitly.
When two options differ only in direction, apply the supply-down or demand-up equals price-up rule.
Watch for trade-policy clues such as export bans, duties and rupee moves; they change domestic price effects.
A wrong answer costs 25% of the marks for the question, so skip only if you cannot eliminate any option.

Practice questions from Fundamental Analysis of Commodities

Demand and Supply Drivers in Commodities in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Demand and Supply Drivers in Commodities: frequently asked questions

What is the stocks-to-use ratio?

It is closing stocks divided by total use (domestic consumption plus exports), usually shown as a percentage. It shows how much buffer remains after meeting demand. A low ratio signals a tight market and higher price risk.

Why are commodity prices so volatile?

Supply and demand respond slowly to price, especially for crops that need a season to grow. A small imbalance therefore causes a large price change, and low inventories make it worse.

How do trade flows affect commodity prices?

Exports, imports, duties, freight and exchange rates link local prices to global ones. An export ban in a major producer can lift global prices, and a weaker rupee raises the rupee price of imported commodities.

Is this topic calculation-based in the NISM-Series-XV exam?

It is mostly conceptual with simple arithmetic, such as building a balance sheet or computing a ratio. Learn the formulas and the direction rules and you can handle both types.