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I’m pleased to announce that the Washington Post has just reported on a major recent finding of mine about America’s supposed manufacturing renaissance: In terms of the supremely important measure of inflation-adjusted output, it never happened.

As summarized in a new piece by correspondent Jim Tankersley, revisions last month to Federal Reserve data show that instead of surpassing the highs it reached on the eve of the last recession, more than seven years ago, manufacturing production in real terms still hasn’t recovered the ground it lost. By contrast, in the two previous economic recoveries, manufacturing took much less time to exceed its previous output peak

Shortly after discovering this change, I shared the information with Tankersley and, gratifyingly, he considered it newsworthy.

His write-up adds an angle I wasn’t aware of – much of the shortfall has taken place in defense and aerospace manufacturing. At the same time, the picture can be usefully fleshed out with these details:

>The timing of the revisions couldn’t have been stranger. They came out just a six days after the Federal Reserve released its report on June industrial production. How much easier these results would have been to report on had the Fed either included them in that release, or waited to issue them for incorporation into last week’s July figures!

>Although much of the manufacturing renaissance coverage and commentary has focused on the sector’s job levels (in fairness, the holders of jobs do things like vote), I’ve closely monitored production because it ultimately matters much more. After all, how can robust employment be generated and maintained over any period of time without robust output? This relationship is especially important to keep in mind given manufacturing’s historically strong productivity performance. Even though efficiency has been growing more slowly as of late, the sector has a proven knack for using technology and other innovations to turn out more stuff with fewer workers.

>The revisions were anything but trivial. The last pre-revision figures showed that the sector’s output was 2.68 percent greater after inflation than the level it reached at the last recession’s December, 2007 onset. According to the new data, from December, 2007 through June, 2015, real manufacturing production had actually shrunk — by 2.28 percent.

The subsequent July industrial production figures actually reported a December, 2007-June, 2015 manufacturing output decline that was even greater — 2.50 percent. That’s because the June, 2015 real output level was less than originally reported. Happily, the initial July reading showed a monthly increase big enough to bring domestic industry to within 1.67 percent of its pre-recession high.

>Consistent with Tankersley’s finding of outsized downward revisions in defense-related industries, the worst newly revealed manufacturing losses came in durable goods industries. Previously, their inflation-adjusted output was judged to be up 9.52 percent since its December, 2007 pre-recession peak. Now the improvement is pegged at only 2.27 percent.

>Since its own pre-recession peak (July, 2007), non-durable goods output has been even worse than originally thought, but by only 7.88 percent versus 5.20 percent.

>These revisions themselves will be revised further down the road (as will the latest June and July data).  It’s possible, in fact, that these changes will soon incorporate research strongly indicating that manufacturing output has been considerably over-counted in recent years. Why? Because there’s abundant evidence that government statisticians haven’t done well at assessing the rapidly falling prices – and therefore the prevalence in manufactured goods – of parts, components, and other inputs that are imported. If these price changes indeed haven’t been fully captured, then many final manufactures – especially in information technology hardware – contain higher levels of foreign content, and thus lower levels of U.S.-made content, than we currently think.

>What we know for sure now, though, is that by the most meaningful measure, there never was a U.S. manufacturing renaissance, and that those who have been singing its praises – ranging from President Obama to the Boston Consulting Group – have simply been manufacturing and selling snake oil.