The U.S. tasks report on Friday rendered Federal Reserve officials with a astound. Unemployment in March had already declined to the level they’d expected it to hit by the end of 2017.

That combined with what some economists viewed as another head-scratcher. Even as unemployment fell to 4.5 percentage, its lowest level in almost 10 years, wages remained on just a gentle upward track. Median hourly earnings rose 2.7 percentage year-on-year, essentially the same as the average over the previous 12 months.

How policy makers react depends on how they unravel that riddle. If they conclude that it’s only a matter of period before falling joblessness triggers a stronger answer in wages and prices, the Fed may be inclined pick up the pace of rate increases. Their current specified of projections degrees them toward three total hikes this year, including a March move already in the books.

But there’s another option. They could decide to lower their approximation for the level at which unemployment becomes inflationary — the so-called non-accelerating inflation rate of unemployment, or Nairu. That would justify sticking to their current outlook for rates.

” There’s a good chance we’ll find them revising the Nairu downward” when Fed officials submit new projections in June, mentioned Thomas Costerg, senior U.S. economist at Standard Chartered Bank.” The Fed is winging a bit in the dark on Nairu. The canary in the coal mine is wage growth, and the fact is wage growth remains tepid .”

It wouldn’t be the first time central bankers shifted that estimate.

Nairu is the word now in fashion for what Nobel Prize-winning economist Milton Friedman first described in 1968 as the” natural rate of unemployment .” First thought of as a fixed degree, Nairu is what economists now see as a trigger point that can move substantially over period. As recently as 2013, Fed officials calculated Nairu in the U.S. around 5.6 percent.

After unemployment reached its Great Recession crest of 10 percent in 2009 and kept on falling without triggering much motion in inflation, they rewrote their estimates downward. Expressed in Fed projections as the “longer-run” approximation for unemployment, the median degree of their estimates now sits at 4.7 percent.

” They’ve already overshot on their measure ,” mentioned Allen Sinai, chairwoman and co-founder of Decision Economics in New York who also thinks Fed officials will ratchet down their estimates in June.

Other economists, however, disagreed.

” Inflation doesn’t hop back to normal as soon as you hit Nairu ,” mentioned Ethan Harris, head of world economics research at Bank of America Merrill Lynch in New York.” The current period looks very similar to what happened in the late 2000 s and the late 1990 s. In each case, unemployment went below Nairu and you got a very gentle acceleration in inflation .”

Neither Harris nor Michael Feroli, chief U.S. economist at JPMorgan Chase& Co. in New York, believed the Fed would respond to the new data by lowering their approximation for Nairu.

” Wage growth isn’t strong, but I think it’s very hard to look at the chart of average hourly earnings and not find an acceleration from the 2.0 percentage rate that prevailed from 2010 to 2015 ,” he said.

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