"There is a fourth, more realistic conception of tariffs that has been effective in some key instances. Advocates of this perspective view tariffs as a shield behind which other, mainly domestic policies can work more effectively. Traditionally, trade laws have allowed countries to use tariffs to protect vulnerable sectors or regions under specific conditions, effectively supplementing domestic social policy.

An even more significant example is infant-industry protection, which has worked best when it exists alongside other instruments to incentivize domestic firms to innovate and upgrade. Some notable cases include the late-nineteenth-century United States, post-1960s South Korea and Taiwan, and post-1990s China. In each of these cases, industrial policies went far beyond trade protection, and it is unlikely that tariff barriers on their own would have produced the gains each of these economies experienced.

Similarly, green policies often require some trade barriers to make them economically and politically viable, as in the case of the European Union’s carbon tariffs and the local-content requirements of the US Inflation Reduction Act. In all these cases, tariffs play a supporting role for other policies that serve a broader purpose, and can be a small price to pay for the larger benefit.

Unfortunately, Trump has not offered a domestic agenda of renewal and economic reconstruction in any of these areas, and his tariffs will likely stand – and fail – on their own."

https://www.project-syndicate.org/commentary/trump-has-wrong-concept-of-tariffs-by-dani-rodrik-2025-01

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