Why so much is read into the words of the Fed chairman.

Following Fed chairman Ben Bernanke's speech yesterday, the usual bout of trying to understand quite how much we can read in to his words has begun. Yet unlike the normally perjorative "Kremlinology" – attempting to infer things from the most minuscule turns of phrase – this Bernankeology is understandable and quite useful.

Central bankers have a strange job. They don't actually have many tools at their disposal; largely just the tripartite decision to raise, lower, or maintain interest rates. Yet many of the outcomes they create come, not from actually using this power, but from creating expectations as to their future use.

Suppose Bernanke knows he is likely to raise interest rates in the first quarter of 2013. Even though his actual power is relatively limited, he can create a wide spectrum of outcomes depending on how he announces this. The market reaction will be extremely different if Bernanke says now that he will raise rates in a years time, compared to if he maintains right up until the day that a rate rise would be inappropriate.

But this power to persuade brings with it its own problems. Just like a legislature, a central bank is fundamentally unable to constrain itself; it can make promises, but everyone knows that it is free to break them at any point.

All of this means that every speech Bernanke gives is likely to be very carefully aimed at creating just the right set of expectations. On the one hand, he can't ever gain a reputation for untrustworthiness, so they have to be scrupulously honest; on the other, actually saying what he believes may create the wrong impression.

Last week, Ryan Avent provided a detailed breakdown of exactly what the benefits of Bernankeology can be, focusing on the Fed's "forward guidance" where it hinted that it would keep interest rates low until at least 2013. He writes:

On the one hand, a pure focus on the language of the Fed's statement indicates that rates are likely to remain low through that period based on the state of the economy... On the other hand, the Fed may be hinting that it will be willing to keep rates low through late 2014 even if the trajectory of the economy warrants a rate increase.

In other words, the Fed might be attempting to commit itself to a deviation from its normal policy rules of the sort that might generate more rapid growth and inflation.

The problem the Fed has is that it needs to generate growth, but that growth is likely to come with relatively high inflation, of the sort which Bernanke has historically fought against. In order to help the economy, he needs to convince "the markets" that interest rates will be kept low even if inflation spirals out of control. The problem is that this, from an inflationary hawk like Bernanke, is unbelievable.

Avent points to a paper (pdf) which breaks down the distinction into two categories:

Delphic, corresponding to the first category above, and Odyssean, corresponding to the second, in which the central bank attempts to commit itself to deviations from typical rules.

Matt Yglesias offers a less refined version of the same strategy, breaking Bernanke's possible responses into an Eeyore response and a Tigger one. Either the Fed chief can "avoid optimistic forecasts as a way of signaling that rates will stay low for a long time," or he "can say we're climbing out of a steep hole so rates will stay low for the next 18 months come what may".

The test for Bernankeologists is to work out whether yesterday's gloomy speech is Odyssean-Eeyore, using gloominess as a mast to bind himself to, or simply Delphic, with the chairman making his most honest predictions and still being pessimistic.

Occupy LA activists march against the Fed in November. Credit: Getty

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Labour tensions boil over at fractious MPs' meeting

Corbyn supporters and critics clash over fiscal charter U-turn and new group Momentum. 

"A total fucking shambles". That was the verdict of the usually emollient Ben Bradshaw as he left tonight's Parliamentary Labour Party meeting. His words were echoed by MPs from all wings of the party. "I've never seen anything like it," one shadow minister told me. In commitee room 14 of the House of Commons, tensions within the party - over the U-turn on George Osborne's fiscal charter and new Corbynite group Momentum - erupted. 

After a short speech by Jeremy Corbyn, shadow chancellor John McDonnell sought to explain his decision to oppose Osborne's fiscal charter (having supported it just two weeks ago). He cited the change in global economic conditions and the refusal to allow Labour to table an amendment. McDonnell also vowed to assist colleagues in Scotland in challenging the SNP anti-austerity claims. But MPs were left unimpressed. "I don't think I've ever heard a weaker round of applause at the PLP than the one John McDonnell just got," one told me. MPs believe that McDonnell's U-turn was due to his failure to realise that the fiscal charter mandated an absolute budget surplus (leaving no room to borrow to invest), rather than merely a current budget surplus. "A huge joke" was how a furious John Mann described it. He and others were outraged by the lack of consultation over the move. "At 1:45pm he [McDonnell] said he was considering our position and would consult with the PLP and the shadow cabinet," one MP told me. "Then he announces it before 6pm PLP and tomorow's shadow cabinet." 

When former shadow cabinet minister Mary Creagh asked Corbyn about the new group Momentum, which some fear could be used as a vehicle to deselect critical MPs (receiving what was described as a weak response), Richard Burgon, one of the body's directors, offered a lengthy defence and was, one MP said, "just humiliated". He added: "It looked at one point like they weren't even going to let him finish. As the fractious exchanges were overheard by journalists outside, Emily Thornberry appealed to colleagues to stop texting hacks and keep their voices down (within earshot of all). 

After a calmer conference than most expected, tonight's meeting was evidence of how great the tensions within Labour remain. Veteran MPs described it as the worst PLP gathering for 30 years. The fear for all MPs is that they have the potential to get even worse. 

George Eaton is political editor of the New Statesman.