What this actually is
A tax on imported goods, paid by the importing company and usually passed on in the price. Governments use them to protect domestic producers, to punish trading partners, or to raise revenue.
Why it matters to a person
For a household they mean higher prices on clothes, appliances, cars and toys. For a company they compress margins or force a supply chain to move. For the Fed they are genuinely hard: a tariff raises prices once, which is not inflation in the technical sense, but if households come to expect more of them it becomes inflation in practice.
For scale
Average US tariff rates fell from over 20% in the 1930s to under 2% by 2015, then rose sharply from 2018 and again from 2025. The Smoot-Hawley tariff of 1930 is the standard cautionary tale, though economists dispute how much of the Depression it caused.
How to read a release
Reading it
Look at effective rates actually collected, not headline announcements, and at whether the exporting country retaliates. Announcement-to-implementation gaps are where most of the market volatility lives.
The mechanism
A tax on inputs and a hit to margins for importers, retaliation for exporters, and an inflation impulse the Fed must weigh.
What to watch: USTR actions; Section 232 and 301 notices; executive orders. Arrives event; the effect typically lasts months. Impact tier 1 — Regime-setting: Moves everything and sets the direction for months or years. These are the discount rate, the level of earnings, the availability of credit, and the shocks large enough to stop the economy. If one of these turns, nothing else in the list matters much.
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What it moves next
Documented transmission: when this moves, these tend to move after it.
What moves it
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