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Contrary to what many trade mavens must think, Paul Krugman’s recent confession that he (and nearly all of his economics colleagues) have seriously misjudged the impact of international trade on America’s manufacturing workers isn’t his first. At least twice before (see here and here), this Nobel Prize-winning economist and New York Times columnist has admitted in print that the economics profession’s consensus was wrong to brush off (and often scorn) claims that post-Cold War trade agreements and similar trade policy decisions would foster a combination of wholly new and unbeatable (but economically unsustainable) forms of import competition for domestic industry, and related job and production offshoring. (I’m among those he’s mauled in print.) And he’s granted that trade policy critics who predicted these consequences and kept pointing to evidence of their emergence were right. (See here and here.)

Still, Krugman’s latest mea culpa is noteworthy for two reasons. First, it undercuts another tenet of trade economics dogma held almost as strongly believed as the belief that trade expansion in all circumstances is a net contributor to human welfare – the related conviction that imbalances like trade deficits don’t matter (at worst).

In particular, the author acknowledges that the rapid and massive increase in America’s manufacturing-dominated goods trade deficit – especially from super-low cost economies (and offshoring destinations) like Mexico and especially China – occurred at exactly the same time that U.S. industrial employment cratered. And not coincidentally, the destruction began right about when China was admitted into the World Trade Organization (WTO). That mattered greatly because the Beijing subsidies and other predatory trade practices that benefited both foreign- and Chinese-owned producers in the PRC gained invaluable protection from unilateral U.S. responses.

How greatly? According to Krugman, the worsening of the trade deficit “reduced the share of manufacturing in GDP by around 1.5 percentage points, or more than 10%, which means that it explains more than half the roughly 20% decline in manufacturing employment between 1997 and 2005.” In other words, most of the manufacturing job loss during this crucial period – which is a particularly important one because that’s when critical masses of recently offshored factories got up and running and began exporting to the American market – should be blamed not on supposedly impersonal and clearly positive forces of progress like containerization in global shipping, and automation generally, but on actions by American leaders.

Not that Krugman abandons conventional trade economics completely. Specifically, he contends that trade deficits generally speaking are still ultimately unimportant, partly because countries can’t grow indefinitely indebted to the rest of the world and “must pay their way eventually.” The post mid-nineties surge in the manufacturing trade shortfall hammered domestic American manufacturing, he explains, only because it skyrocketed so suddenly.

Readers, however, will ask themselves how the United States can pay its way in the foreseeable future when manufacturing still dominates its lopsided goods trade flows. And they should note that although the damage to manufacturing could still prove temporary, it’s already lasted nearly twenty years, with no imminent end in sight until the past year. (See this post for one of my recent claims that President Trump’s trade policies are starting to bend the curve.)

Second, and following logically from the first point, Krugman continues to insist that protective tariffs should be avoided. Now his opposition focuses on his contention that the trade-related danger to U.S. manufacturing is coming to an end. The China shock in particular, which spearheaded the recent period of “hyperglobalization,” was “a one-time event” that’s already showing signs of ebbing.

But if Krugman was so offbase in evaluating trade’s economic effects, why should such predictions deserve any credibility? Off the top of my head, I can think of several reasons for ongoing concern. For example, China still has massive reserves of super cheap, U.S. wage-depressing labor in its interior and, counter-intuitively, in its national student body. In addition, the progress Beijing has fostered in capital- and technology-intensive industries means that these sectors of American manufacturing will keep facing the same kinds of low-wage (but high productivity) challenges that decimated less advanced, more labor-intensive U.S.-based sectors in previous decades. Moreover, if China does lose competitiveness even in these portions of manufacturing, there’s no shortage of bargain basement third world population giants – like India, Indonesia, and Brazil – that would be more than happy to receive more manufacturing investment from the United States and other high-income countries.

Everyone’s entitled to make mistakes – even know-it-alls like Krugman, who’s known for torching those disagreeing with him as know-nothings and liars. And Krugman deserves praise for owning up to his own mistakes. But it’s also appropriate to ask this question: Since Krugman first established his economic chops as a trade expert, and since he’s clearly been proven wrong about the leading trade-related controversy of our time, how many more strikes does he get?