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How to read trade data without fooling yourself

Last reviewed 2026-10 · 6 sections

Trade statistics are powerful and routinely misread. The same number can be presented as 'the market is worth $16 billion' or as 'you can sell into a $16 billion market' — and only the first is what the data says. This guide is about reading the numbers for what they are.

Import value is what the destination bought — not what you can sell

Import value measures what a country bought from the world in a period. It is a measure of market size. It is not a measure of unmet demand, of demand for your product at your grade, or of your ability to compete on price, quality or logistics. A large import value with a dominant incumbent supplier can be a worse opportunity than a small one you can serve.

Unit value is a customs indicator, not a selling price

Unit value = customs value ÷ net weight for the period. It is computed from customs declarations, so it blends every quality grade, every Incoterm and every buyer in that country. It is a useful sanity check on price bands. It is not your price, and a customs value is not a market clearing price.

Mirror gaps, reporting lags and revisions

  • Mirror statistics disagree. Country A's record of exports to B rarely equals B's record of imports from A. Timing, valuation basis (FOB vs CIF), transit, re-exports and reporting error all move the number.
  • The latest year is provisional. Recent periods get revised, sometimes materially. Do not build a growth story on a single preliminary year.
  • Re-exports distort. Goods passed through an entrepôt (Singapore, UAE, Netherlands are classic examples) appear as imports to the hub and exports from it, even though the end market is elsewhere.
  • Classification changes. The HS is revised periodically (HS 2017, HS 2022). A long time series can break across a revision if the code moved.

Supplier concentration: read it as room, not as a guarantee

A concentration measure such as the Herfindahl–Hirschman Index (HHI) tells you how spread out the supplying countries are. A low value means many suppliers share the market, which usually means it is genuinely contestable. A high value means one or two origins dominate — which can mean incumbency is entrenched (difficult) or that a single relationship is fragile (an opening). The statistic does not tell you which; that is a judgement you make with commercial context.

Comparisons need at least two periods

Growth, and anything built on growth, is meaningless from a single year. When a tool says it cannot score markets, that is usually the reason: there is no trend to measure. Cross-check a trend against the value and the weight series together — if value rises while weight is flat, you are looking at price, not volume, and vice versa.

Where the data stops

Trade statistics describe flows of goods, aggregated. They do not contain buyers, prices, quality specifications, payment terms, tariffs, freight rates or regulatory requirements. No trade-data tool can tell you who to sell to or what it will cost — those need primary research and a quote. Where this toolkit cannot source a figure, it says so rather than estimating one.

Use the tools

Sources & further reading

UN Comtrade India DGCI&S TradeStat Eurostat (Comext)

These guides summarise public material from the bodies named above. They are general information, not advice on a specific shipment, and they are not a substitute for a ruling from your customs authority or a qualified customs broker / consultant.

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