U.S. Fed's Janet Yellen throws down the gauntlet on Trump's economic prescription: Don Pittis

If Donald Trump thought campaign threats were going to frighten off U.S. Federal Reserve chair JanetYellen, thefeisty central bank governor has now set the record straight.

In testimony that was a rational contrast to his erratic statements, Yellen vowed to stay and fight.

"I was confirmed by the Senate to a four-year term that ends in January of 2018 and it is fully my intention to serve out that term," Yellen told the congressional joint committee on economics.

As well as that bold statement, Yellen made her toughestcommitment yet to raise interest rates in December.

• Fed rate hike increasingly likely in December, Janet Yellen hints

During the campaign, including in one of the debates, Trump blamed the central bank for the economy's ills. He has complainedYellenhas held rates too low and waspoliticallybiased. He has revealed a preference for a gold standard and advisers have suggested other ways to take away the bank's independence.

Trump objects to the Fed's regulation of financial institutions, saying the rules are hurting growth.

But yesterday,Yellenfought back.

She made a strong case in favour of bank independence. And she took a stand against Trump's promise of massive deregulation.

For the stability of the U.S. economythat is exactly what she should be doing, according to central banking historian Sebastian Mallaby, author of a recent book on former Fed chairman Alan Greenspantitled The Man Who Knew.

He says Yellen must follow in the footsteps of Greenspan to defend bank independence.

Punching noses

"He came into office at a time when it was normal for politicians to beat up the Fed. And he beat up the politicians," said Mallabyin aninterviewonCBC'sOn the Money. "When they punched him on the nose hepunched themtwice. I think that's what Janet Yellen and the Fed has to study, that model."

There wasn't much punching in Yellen's testimony, but in her own measured way, the latest Fed chair showed she wasn't intending to be pushed around, not least of all on her commitmentto raise interest rates.

Asked if the uncertainty over Trump's policieswarranted a delay in rate hikes until January, Yellen said that even continued confusionwas unlikely to alter the plans of the rate-setting Federal Open Markets Committee.

Uncertainty to continue

"My guess is that uncertainty about these matters will last for some considerable time," replied Yellen. "The committee has said for a long time that gradual increases in the federal funds rate are likely to be appropriate to promote our objectives."

Mallaby saidYellen should go even further to show the president-elect who's the boss of monetary policy,raising rates by half a percentage point rather than a quarter next month, or at least hinting very strongly of bigger hikes ahead.

"I think the danger is that interest rates needed to be lifted at the next meeting, and now you have Trump coming in with what is basically a pretty inflationary economic policy," says Mallaby. "And so the Fed needs to respond to that, and I think it needs to signal very clearly that it's not going to be intimidated."

Rather than being aggressive, Yellen's technique was to be stubbornly analytical and deliberate in her implied criticism of Trump's policy.

That was certainly the case in her response to the idea of deregulation, including the removal or watering down of theDodd-Frankrules that were imposed to prevent a repeat of the meltdown and taxpayer bailout of the banking systemin 2008.

Critics of financial regulation describe the rulesas restrictive, forcing banks into a straitjacket of red tape.

The Wall Street Journal has reported that the Trump team is planning to "dismantle" Dodd-Frank, and "replace it with new policies to encourage economic growth and job creation."

Brewing conflict

While cutting stress tests and regulation could reduce banking costs and reignite short-term growth, Yellenpublicly worried about the long-term damage to the economyif deregulation creates another "devastating financial crisis" like the last one. It sounds like a conflict brewing.

While Yellenindicatedher support for Congress and the president to make budgetary decisions, she warned that the U.S. economy was at a tipping point, and that too much stimulation could launch an inflationary spiral. That would only be worse if the administrationtries to wrench independence away from the central bank.

"There is clear evidence of better outcomes in countrieswhere central banks can take the long view,are not subject to short-term political pressures and sometimes central banks need to do things that are not immediately popular for the health of the economy," Yellen testified.

"The story in every country that's experienced very high or even hyper-inflation is one where a central bank has been forced to follow the dictates of a government that has compromised its independence."

Follow Don on Twitter @don_pittis

More analysis from Don Pittis