Guide

Import-export price index explained

The U.S. import and export price indexes measure how much American buyers pay for goods arriving at the border and how much foreign buyers pay for U.S. shipments leaving it — in dollar terms, before trade volumes roll into the trade balance. Published monthly by the Bureau of Labor Statistics in the MXD release (U.S. Import and Export Price Indexes), they are the cleanest read on trade-side inflation: oil shocks, dollar moves, and global supply disruptions often appear here weeks before they reach consumer CPI. Import prices feed domestic PPI margins; export prices shape competitiveness and the balance of payments. This guide covers BLS methodology, petroleum vs core splits, locality of origin vs destination, terms of trade, exchange-rate pass-through, a Harbor Export monthly read worked example, an indicator decision table, common pitfalls, and an investor checklist.

What import and export price indexes measure

Unlike the trade balance — which multiplies prices times quantities — the import and export price indexes track price change only, holding the basket of goods conceptually fixed and reweighted annually. BLS collects actual transaction prices from customs documentation and surveys, converts foreign-currency invoices to U.S. dollars at the transaction date, and publishes month-over-month and year-over-year percent changes, seasonally adjusted.

The headline series most markets watch:

Import price index — all imports; petroleum and non-petroleum splits published separately.
Export price index — all exports; agricultural and non-agricultural splits.
Import prices ex petroleum — core trade inflation proxy; strips volatile energy.
Import prices ex fuels — broader energy exclusion including natural gas.

Indexes use December 2023 = 100 in the current vintage (BLS rebases periodically). A 0.4% monthly rise in import prices means the same representative basket of imports cost 0.4% more in dollars — whether because foreign producers raised local prices, the dollar weakened, or freight and insurance surcharges increased.

Locality of origin vs locality of destination

Import prices use locality of origin — where the good was produced, not the last country it transited. A German-made machine shipped through Rotterdam counts as German import prices. Export prices use locality of destination — prices of goods leaving the U.S. bound for each trading partner region. This distinction matters when supply chains reroute: origin-based import prices can rise on Chinese electronics even if assembly moved to Vietnam, if value-added still originates in China.

Release calendar and MXD methodology

BLS publishes import and export prices around the second week of each month at 8:30 a.m. ET, typically one business day after the economic calendar slot for the prior month's data. The release is labeled MXD on the BLS website. Revisions are rare for the prior month; annual weight updates can shift levels without changing recent month-over-month dynamics materially.

Coverage includes goods trade only — not services. That is a critical limitation: software exports, tourism, and financial services do not appear. For a services-heavy economy, goods import prices still matter because physical inputs (semiconductors, autos, apparel, industrial metals) dominate many CPI categories and the visible trade deficit.

How prices enter the index

BLS samples import and export transactions from Census and customs microdata.
Foreign-currency prices convert to dollars using daily exchange rates at transaction time.
Item-level price relatives aggregate with weights from the previous year's trade value shares.
Seasonal adjustment removes recurring patterns (e.g. agricultural harvest cycles).

Because conversion happens at transaction rates, a sudden dollar depreciation can raise import prices even if foreign producers hold local prices flat — and vice versa. Markets often pair MXD with FX moves on release morning to separate currency effects from foreign inflation.

Import prices vs domestic inflation

Import prices are a pipeline input to domestic inflation, not a perfect forecast. Pass-through is partial and lagged: retailers and manufacturers absorb margin when import costs spike, then gradually raise shelf prices over one to three quarters. Empirically, a 10% rise in non-petroleum import prices might pass through roughly 2–4% to core goods CPI over 12 months — highly variable by category and competitive intensity.

Petroleum and energy

Petroleum import prices are among the most volatile series in macro data. A single geopolitical shock can move headline import prices 3–5% month-over-month while core ex-petroleum is flat. Analysts almost always quote import prices ex petroleum when discussing underlying trade inflation. Natural gas and electricity imports are smaller but can spike in winter.

Link to PPI

PPI final demand includes domestic production; many categories compete directly with imports. When import prices fall on a stronger dollar, domestic producers face pricing pressure — PPI goods can soften even without a recession. Conversely, rising import prices on supply-chain bottlenecks preceded the 2021–2022 PPI surge. Watch import prices leading PPI goods by 1–2 months in normal cycles.

Link to CPI

CPI includes imported consumer goods (apparel, electronics, vehicles) and imported energy. Core goods CPI correlation with import prices ex petroleum is moderate — hedging, long-term contracts, and domestic substitution blur the link. Services CPI (rent, healthcare) barely responds to import prices at all. Fed officials cite import price deceleration as evidence goods disinflation can continue even while services CPI is sticky.

Export prices and terms of trade

Export prices measure dollar prices received by U.S. exporters. Rising export prices can reflect global commodity strength (soybeans, aircraft, industrial chemicals) or dollar weakness making U.S. goods cheaper abroad in local currency — boosting volume later in the trade data.

Terms of trade compare what the U.S. earns on exports versus what it pays for imports, often approximated as:

Terms of trade index ≈ Export price index / Import price index

Improving terms of trade mean the U.S. can buy more imports per unit of exports — a real income gain for the country. Deteriorating terms (import prices rising faster than export prices) squeeze corporate margins at import-dependent firms and widen the nominal trade deficit if volumes hold steady. Commodity exporters (Australia, Brazil) watch this ratio obsessively; the U.S. is mixed — energy and agriculture exports vs manufactured imports.

Export prices vs industrial production

Weak export prices plus strong dollar often precede softer industrial production in manufacturing-heavy regions. Aerospace, machinery, and chemical exports are price-sensitive; a 5% dollar appreciation can lag into export price declines two to three months later.

Country and commodity detail

MXD publishes import price indexes for major trading partners — China, Mexico, Canada, European Union, Japan, and others. These are useful when tariffs or trade policy shift: Section 301 tariffs on Chinese goods raised measured import prices from China even when global factory gate prices were flat, because the tariff is part of the landed cost BLS captures.

Commodity breakdowns include:

Industrial supplies and materials — metals, chemicals, building materials; high PPI correlation.
Capital goods — machinery, computers, aircraft parts; long contract lags.
Automotive vehicles and parts — large CPI weight; supply-chain sensitive.
Consumer goods — apparel, household items; direct retail pass-through.
Foods, feeds, and beverages — agricultural export prices; weather and harvest driven.

Cross-check country tables with bilateral trade balance data: prices can rise while volumes fall (inelastic oil demand) or prices fall while volumes surge (discounting to clear inventory).

Worked example: Harbor Export monthly trade read

Harbor Export — a fictional U.S. industrial components exporter in our recurring macro examples — updates its pricing and hedge book after each MXD release. Suppose January data show:

Import prices +0.8% m/m (consensus +0.3%); export prices +0.2% m/m (consensus +0.1%)
Import prices ex petroleum +0.4% m/m; petroleum import prices +3.2% m/m
Year-over-year import prices +2.1%; export prices +1.4%
China import prices +0.6% m/m; Mexico +0.2% m/m
EUR/USD fell 1.5% during the reference month

Harbor's trade desk brief:

Headline import beat = mostly oil — petroleum drove the upside surprise; core ex-petroleum in line. No change to domestic core CPI forecast; energy CPI may tick up next month.
Terms of trade deteriorated slightly — import prices outpaced exports m/m; Harbor's euro-zone customers see U.S. goods 1.5% pricier in euros from FX alone before Harbor adjusts list prices.
China input costs rising — Harbor sources specialty fasteners from Shenzhen; +0.6% import prices plus prior tariff rates suggest 40 bps gross margin pressure unless Harbor pushes surcharges in Q2 contracts.
Export price resilience — +0.2% export prices despite strong dollar implies global industrial demand holding; aligns with steady PMI New Export Orders above 50. Harbor maintains volume guidance.
Hedge action — Harbor layers three-month forward contracts on EUR receivables; import price/Fx combo signals delayed pass-through risk on European shipments.

The pattern: MXD separates price shocks from volume stories in the trade balance — Harbor can reprice before Census publishes dollar export totals.

Indicator decision table

Pattern	What it suggests	Typical market read
Import prices ex petroleum falling 3+ months	Goods disinflation pipeline	Dovish; core goods CPI may soften; margin relief for importers
Import prices rising, export prices flat	Deteriorating terms of trade	Trade deficit pressure; import-dependent retailers squeezed
Export prices surging, import prices tame	Improving terms of trade; commodity or weak-dollar tailwind	Bullish for exporters, agriculture, energy; supportive for IP
Import prices spike on petroleum only	Energy shock, not broad trade inflation	Headline CPI energy up; core Fed reaction limited unless sustained
China import prices rising during tariff headlines	Policy-driven landed cost increase	Margin hit for retailers sourcing China; reshoring narrative strengthens
Import prices rise with dollar appreciation	Foreign producer price inflation dominant	Global inflation concern; less benign than FX-only move

Common pitfalls

Equating import prices with CPI — partial pass-through, domestic competition, and services-dominated CPI limit correlation.
Ignoring petroleum volatility — headline import prices without ex-petroleum mislead in oil shock months.
Expecting services coverage — MXD is goods only; tourism and software trade are absent.
Confusing prices with the trade deficit — a rising deficit can coexist with falling import prices if volumes surge.
Overreacting to one month — MXD is less revised than CPI but monthly noise is high; use 3-month trends.
Missing dollar interaction — always check whether FX moves explain the print before blaming foreign inflation.
Tariff blind spots — new duties raise measured import prices without changing factory gate prices abroad.

Investor checklist

Track headline, ex-petroleum, and ex-fuels import price changes m/m and y/y.
Compare export vs import price growth for terms-of-trade direction.
Pair release with DXY or major pair moves during the reference month.
Cross-check petroleum import prices against WTI and retail gasoline futures.
Read China, Mexico, and EU country import price tables for supply-chain exposure.
Lead import prices ex petroleum into PPI goods and core goods CPI by 1–2 quarters.
Separate MXD price signals from Census trade balance volume data later in the month.
Flag tariff or trade-policy dates that mechanically lift import price indexes.
Monitor export prices for dollar-sensitive sectors (machinery, chemicals, ag).
Log surprises vs consensus — MXD moves markets less than CPI but informs inflation narrative.

Key takeaways

Import and export price indexes measure dollar price change at the border — volumes come later in trade balance data.
BLS MXD is goods-only; ex-petroleum import prices are the core trade inflation read.
Import prices pipeline into PPI and goods CPI with partial, lagged pass-through.
Terms of trade (export prices vs import prices) signal national real income and exporter competitiveness.
Always disentangle petroleum shocks, dollar moves, and foreign producer inflation before trading the print.