By Jamie McGeever

ORLANDO, Florida, Dec 11 (Reuters) - ‌Wall Street was mostly higher on Thursday - the Dow and Russell 2000 indices hit new highs but the Nasdaq fell - while shock U.S. jobless claims figures rekindled concern over the labor market and dragged the dollar and Treasury yields lower.

More on that below. In my column today, I look at ‍how Fed Chair Jerome ‌Powell hopes to thread the needle between strong growth and benign inflation - high productivity.

If you have more time to read, here are a few articles I recommend to help you make sense of what happened in markets today.

1. Investors expect relief in money markets as Fed resumesT-bill purchases 2. Big central banks edge back towards ⁠hiking mode, but Fedkeeps cutting 3. Fade the Fed, global rates are heading higher: MikeDolan 4. AI bubble? Opinions divided on tech's trillion dollarquestion 5. China promises fiscal boost next year, recognises'prominent' imbalance

Today's Key ‌Market Moves

* STOCKS: Dow, Russell 2000 leap to new highs, Nasdaqfalls but claws back most of its early losses. Mexico at recordhigh. * SECTORS/SHARES: U.S. info comms -1%; tech -0.6%.Materials, financials up ~2%. Oracle plunges 11%. * FX: Dollar index slides to 2-month low, 14-month low vsChinese yuan at 7.0550. Brazilian real +1%, bitcoin dips below$90,000 but recovers. * BONDS: Treasury yields slide 5 bps at the front end,bull steepening the curve. * COMMODITIES/METALS: Oil -1.5%. Silver's surge continues,to new high above $64/oz.

Today's Talking Points

* QE or not QE, that is the question

The Fed's decision to buy $40 billion of T-bills a month - a surprise to many, but not regular readers here - is to ensure there are plentiful bank reserves in the system. This will avert financial system dislocation, prevent a spike in interbank rates, and ensure the fed funds rate stays within target range.

So, it's ⁠not QE. Or is it? Many analysts argue it effectively is, as the Fed is still expanding its balance sheet, only just at the ultra-short end of the curve. Plus, with the Treasury borrowing more heavily in bills, it is akin to monetizing the debt. This debate will rage into next year.

* There's plenty claim to go around

Powell on Wednesday made the eyebrow-raising observation that, due to issues with the ​way jobs data are collated, the U.S. economy could be shedding around 20,000 jobs a month rather than the recent average gain of around 40,000.

On Thursday, weekly jobless claims surged to a ‌four-and-a-half-year high. This may be skewed by the recent government shutdown, but it will no doubt embolden the Fed doves, including Powell. It also adds ⁠another layer of complexity to the Fed debate - should policy be calibrated to counter employment or inflation risks?

* Oracle, Cisco ships pass in the night

AI bubble talk and comparisons with the internet boom and bust are raging again, with two giants of the dotcom era back in the news. Oracle shares sank as much as 16% on Thursday, at one point their worst day since March 2001, while Cisco shares are back above $80 for the first time since the market peak of March 2000.

It's hard to envisage another Cisco today, where a bellwether stock takes nearly a quarter of a century to revisit its bubble peak. ​And in some ways, Oracle has behaved like a meme stock this year - up 36% in a day, more than doubling year-to-date, then plunging 50% in a few months. The AI ride next year is shaping up to be something of a rollercoaster.

Powell bets big on productivity boost rescuing boxed-in Fed

Federal Reserve Chair Jerome Powell admitted on Wednesday that there is still no "risk-free" path for the central bank as it seeks to bring down stubbornly high inflation while also supporting an increasingly creaky labor market. But he suggested the Fed might have a "get-out-of-jail-free" card: higher productivity.

    Speaking to reporters after the Fed cut its policy rate by 25 basis points and published its revised economic projections, Powell indicated that productivity may square the circle of solid growth, sticky inflation and a soft jobs market.

    High productivity means workers are producing more output per hour. This keeps a lid on unit labor costs and therefore inflation, while also helping to drive stronger wage growth, purchasing power, and overall economic ​activity.

    It is a big factor behind ‍Fed officials' rosier outlook for 2026 and expectation for only one more quarter-point rate cut ​next year.

    Policymakers raised their median 2026 GDP growth projection to 2.3% from 1.8% in September, while lowering their outlook for headline inflation to 2.4% from 2.6%. Powell said almost half of the growth upgrade reflects a reacceleration of activity following the government shutdown, but much of it is due to high productivity too.

    And that's not only because of artificial intelligence. Powell said the U.S. economy's elevated productivity rate of around 2% for the last several years predates the recent AI boom. But the new technology is helping.

    "There is no risk-free path for monetary policy," said Jeffrey Roach, chief economist for LPL Financial, echoing Powell, "but it seems the committee is banking on higher productivity, implying stronger growth despite softer job creation."

    BETTING ON THE WRONG HORSE?

    But there are potential problems with the productivity story.

    First, relying on it as a silver bullet is a gamble, both because productivity is notoriously challenging to forecast – or even to measure properly – and because it is too early to say what the economic impact of AI will be.

    As a recent Institute of International Finance report warned, "if AI adoption remains concentrated among a handful of hyperscalers and specialized firms, returns will likely plateau, leaving overall growth vulnerable once the current investment cycle peaks."

    What's more, the flip side of AI's positive impact on productivity could be massive job losses. This could create "social and labor market implications that we ⁠don't have the tools to deal with," Powell said.

    Second, higher sustained productivity implies faster growth and therefore a higher neutral rate of interest, or "r-star." That's the neutral interest rate that neither stimulates nor restricts activity when the economy is running at full employment with stable inflation.

    Powell said policy is now in a broadly neutral range, with rates having been cut 175 basis points since September last year. But if there is a productivity boom underway and potential growth is higher, r-star ​and the fed funds rate should be higher too.

    In this scenario, current policy might actually be too loose.

    "All things equal yes, but all things aren't equal," Powell said when asked on this matter on Wednesday. "There are many things pushing in different directions on where the neutral rate would be."

    Estimates of r-star, a theoretical figure, are understandably varied. Two closely watched models co-created by New York Fed President John Williams put r-star at 1.37% or 0.84% at the end of June. Fed officials' median long-run implied r-star projection is around 1%.

    Productivity may offer the Fed some breathing room. Powell indicated that the Fed will pause to assess the incoming data before determining its next move. Rates futures markets believe him and are not fully pricing in another rate cut until June.

    "They are buying into the AI productivity story. That's the only way you can interpret this," said David Kelly, chief global ‌strategist at JP Morgan Asset Management.

Of course, if that story does not play out, Powell and his successor will have their work cut out for them in 2026.

What could move markets tomorrow?

* India inflation (November) * Germany inflation (November, final) * UK industrial production (October) * U.S. trade (September) * U.S. Fed officials scheduled to speak include PhiladelphiaFed president Anna Paulson, Cleveland Fed president BethHammack, and Chicago Fed president Austan Goolsbee

Want to receive Trading Day in your inbox every weekday morning? Sign up for my newsletter here. 

Opinions expressed are those of the author. They do not reflect the views of Reuters News, which, under the Trust Principles, is committed to integrity, independence, and freedom from bias.

(By Jamie McGeever; Editing by Nia Williams)