The political appeal of tariffs is easy to understand. The actual mechanics of what they do — and don’t do — are considerably less flattering than the rhetoric suggests.
The underlying problem tariffs are deployed to address is real: the hollowing out of domestic manufacturing, strategic dependency on adversarial supply chains, and wage compression in trade-exposed industries. These are legitimate concerns with decades of data behind them. The argument for industrial policy — for the state taking a deliberate role in shaping which industries exist and where — is more defensible now than it was thirty years ago, and the post-pandemic supply chain disruptions made that case viscerally rather than theoretically.
Tariffs, however, are a blunt instrument applied to what is fundamentally a structural problem. A tariff raises the price of an imported good. It does not automatically create domestic capacity to replace it. If the manufacturing base, the skilled labor, and the supply chain infrastructure have been absent for two decades, a price signal alone does not reconstitute them on any useful timeline. What it does in the interim is transfer costs to domestic producers and consumers while the adjustment — if it comes at all — takes years.
The sectors where tariffs have demonstrably worked tend to be ones where domestic capacity already existed and needed protection from predatory underpricing, not ones where the capacity needed to be rebuilt from scratch. The difference matters enormously and is almost never made in policy debates.
The right tools — industrial subsidies, workforce retraining, strategic procurement requirements, R&D investment — are slower, more expensive, and harder to explain in a campaign speech. That is why tariffs keep getting used instead. The politics are cleaner than the economics.