The signals could not be clearer.The governor of the Bank of England, Mark Carney, has dropped some heavy hints that interest rates will see their first rise in seven years some time in the autumn.
Members of the Monetary Policy Committee, both past and present, have been lining up to tell us that rates will have to go up imminently.
Policymakers are able to say this because the economic climate is improving. Growth is decent. Unemployment is falling rapidly. House prices are booming. New jobs, and new businesses, are being created. The deficit is coming down. Business confidence is rising.
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What's more, the current low rates were meant to be emergency' rates, but there isn't much sign of an emergency right now. So it seems only sensible to start pushing rates back to their normal levels not least because it would be good to have some scope to cut them again the next time the economy turns down.
In response to all of this, City traders have been pushing the pound higher and lenders have been nudging up interest rates. It is about as close to a done deal as the City ever gets.The trouble is, a rate rise is not nearlyas certain as everyone now assumes. There are at least four surprises that could derail it.
First is a geopolitical crisis. The uprising in Iraq has turned very nasty, and could easily turn into a regional war, sucking in Iran and Turkey, and in turn the US as well. It is only a few weeks since everyone was worrying about the conflict in Ukraine, and its border with Russia remains tense.
America is now reluctant to involve itself in conflicts and that's one reason why the world is becoming a dangerous place again. If a serious war breaks out somewhere, commodities such as oil will soar in price, and trade will slump. And that rate rise will be swiftly forgotten about.
Second is falling prices. The eurozone is slipping into a deflationary spiral, with prices falling in many countries, and inflation close to zero across the region. There is no reason to think that we are immune from that just because we aren't in the euro.
Hungary, for example, is already in outright deflation, and it's not inside the single currency either. Since around 18% of our GDP isaccounted for by imports from Europe, there is no reason why our prices should not fall along with Europe's.
Indeed, British inflation is already falling fast and the higher pound will reduce it even further. If inflation hits zero, or minus 0.2% by the autumn, is the Bank still going to raise rates?
Modern central banks regard deflation as the greatest of all evils. And of course, with prices falling, even a 0.5% interest rate will look quite high. If that happens, a rate rise is about as likely as Ed Balls admitting the economy is doing well again.
Third, the coalition could fall apart. The Liberal Democrats may well decide the only way to save any seats at the next election is to walk out of the government early and put themselves in opposition.
Either David Cameron would have to soldier on alone with a minority government for six months, or he would have to call an early election. Either way, the Bank would be reluctant to add tothe instability with the first rate risesince the crash.
Finally, there could be a stock-market collapse. Are markets dangerously overstretched and heading for a big fall? Or is this just the start of another ten-year bull market, with the FTSE heading all the way up to 12,000, or even higher?
Just like everyone else, I don't really have any idea. What is clear is that taken from the lows of 2009, this has already been an exceptionally long bull run by any historic standards, and a major crash should be about as surprising as rain interrupting play at some point during Wimbledon.
If that happens, the Monetary Policy Committee is going to file that plan for a rate rise in the small circular cabinet underneath the desk.
Any of these scenarios might happen, or none of them. Something else entirely unexpected might come along between now and the autumn to change the outlook for the world economy the four possibilities outlined above are only the fairly obvious ones.
In reality, all Mark Carney and the rest of the Monetary Policy Committee are engaged in right now is a fresh version of the infamous forward guidance' with which Carney started his term as governor. And that didn't survive for long either.
In fact, Carney has no more idea what the world will look like in October than the rest of us do. He might well be planning to put rates up then, if the world looks exactly the same as it does now. The chances of that are not very high, however.
The economy changes all the time and eachtime it does so, the case for an adjustment in monetary policy will change with it.
Rates will rise one day, when all the arguments for putting them up look compelling, and when inflation shows signs of needing to be brought under control. Until the day a rise isannounced, however, it's not a donedeal and if the City thinks it is, it's making a mistake.
Matthew Lynn is a columnist for Bloomberg, and writes weekly commentary syndicated in papers such as the Daily Telegraph, Die Welt, the Sydney Morning Herald, the South China Morning Post and the Miami Herald. He is also an associate editor of Spectator Business, and a regular contributor to The Spectator. Before that, he worked for the business section of the Sunday Times for ten years.
He has written books on finance and financial topics, including Bust: Greece, The Euro and The Sovereign Debt Crisis and The Long Depression: The Slump of 2008 to 2031. Matthew is also the author of the Death Force series of military thrillers and the founder of Lume Books, an independent publisher.
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