The Trump administration has announced it plans to raise taxes on Americans in the form of tariffs. On Thursday, the president promised steel and aluminum executives that he would protect them against foreign competition by levying tariffs on both metals in the coming weeks: 25 percent on steel and 10 percent on aluminum. The effect of tariffs will be to impose a higher tax burden on Americans, while increasing the cost of living, and the costs imposed on entrepreneurs using the taxed materials.

For centuries, economists have examined and explained the negative consequences of tariffs. And for more than a century, the economists of the Austrian school have added even more sophisticated and modern arguments against tariffs.

Thus, on the matter of tariffs, there is no need to re-invent the wheel.

After all, Henry Hazlitt in his seminal Economics in One Lesson covered the topic well: 

Now let us look at the matter the other way round, and see the effect of imposing a tariff in the first place. Suppose that there had been no tariff on foreign knit goods, that Americans were accustomed to buying foreign sweaters without duty, and that the argument were then put forward that we could bring a sweater industry into existence by imposing a duty of $5 on sweaters.

There would be nothing logically wrong with this argument so far as it went. The cost of British sweaters to the American consumer might thereby be forced so high that American manufacturers would find it profitable to enter the sweater business. But American consumers would be forced to subsidize this industry. On every American sweater they bought they would be forced in effect to pay a tax of $5 which would be collected from them in a higher price by the new sweater industry.

Americans would be employed in a sweater industry who had not previously been employed in a sweater industry. That much is true. But there would be no net addition to the country’s industry or the country’s employment. Because the American consumer had to pay $5 more for the same quality of sweater he would have just that much less left over to buy anything else. He would have to reduce his expenditures by $5 somewhere else. In order that one industry might grow or come into existence, a hundred other industries would have to shrink. In order that 20,000 persons might be employed in a sweater industry, 20,000 fewer persons would be employed elsewhere.

But the new industry would be visible. The number of its employees,the capital invested in it, the market value of its product in terms of dollars, could be easily counted. The neighbors could see the sweater workers going to and from the factory every day. The results would be palpable and direct. But the shrinkage of a hundred other industries, the loss of 20,000 other jobs somewhere else, would not be so easily noticed. It would be impossible for even the cleverest statistician to know precisely what the incidence of the loss of other jobs had been—precisely how many men and women had been laid off from each particular industry, precisely how much business each particular industry had lost—because consumers had to pay more for their sweaters. For a loss spread among all the other productive activities of the country would be comparatively minute for each. It would be impossible for anyone to know precisely how each consumer would have spent his extra $5 if he had been allowed to retain it. The overwhelming majority of the people, therefore, would probably suffer from the optical illusion that the new industry had cost us nothing.

It is important to notice that the new tariff on sweaters would not raise American wages. To be sure, it would enable Americans to work in the sweater industry at approximately the average level of American wages (for workers of their skill), instead of having to compete in that industry at the British level of wages. But there would be no increase of American wages in general as a result of the duty; for, as we have seen, there would be no net increase in the number of jobs provided, no net increase in the demand for goods, and no increase in labor productivity. Labor productivity would, in fact, be reduced as a result of the tariff.

And this brings us to the real effect of a tariff wall. It is not merely that all its visible gains are offset by less obvious but no less real losses. It results, in fact, in a net loss to the country. For contrary to centuries of interested propaganda and disinterested confusion, the tariff reduces the American level of wages. Let us observe more clearly how it does this. We have seen that the added amount which consumers pay for a tariff-protected article leaves them just that much less with which to buy all other articles.