Raising interest rates with zero inflation is a hard sell
U.S. one hundred dollar notes are seen in this picture illustration taken in Seoul February 7, 2011. REUTERS/Lee Jae-Won · Reuters

By Mike Dolan

LONDON (Reuters) - Americans and Britons bracing for their first interest rate rises in almost a decade are puzzled: why are rates about to go up when there's no inflation?

Both the Federal Reserve and Bank of England are proclaiming that they are on the cusp of raising interest rates for the first time in almost a decade. It may take a few months, but the message they are sending still heavily-indebted households either side of the Atlantic is clear: 'be warned'.

It's not hard to see why near-zero interest rates should be 'normalized' when you do a quick economic health check.

After years in the post-credit crisis doldrums, both economies are now growing at brisk annual clips of between 2 and 3 percent. Jobless rates are near long-term averages of less than 6 percent. Real estate and financial asset prices have raced higher over the past couple of years.

The problem is that annual consumer price inflation rates are zero in Britain and just 0.1 percent stateside, far below the 2 percent consumer price growth targets both have committed to in one form or another as a policy guide.

Even the Fed's favored inflation measure - the index of personal consumption expenditures (PCE) - is running as low as an annual 0.3 percent.

The policy mantra for much of the year has been that headline inflation was artificially depressed by the collapse of energy and raw materials prices in late 2014. Once these stabilized - as they did through the spring - then the assumption was these base effects would wash out of CPI indexes and reveal far livelier 'core', largely domestically driven, price rises pushing headline inflation back toward its target.

In other words, central banks would face down what they saw as a temporary drop in headline inflation, focus on core price developments and pull the interest rate trigger anyhow.

The 'core' PCE for the United States is indeed punchier. But, at just 1.3 percent, it's still well below target rates. 'Core' UK inflation also remains less than 1 percent.

It's further complicated this summer, not least because the bursting of a stock bubble in Shanghai has stoked intense anxiety about the slowing Chinese economy.

The result has been another tailspin in commodity prices. Oil has lost a further 20 percent since the start of July and the Commodity Research Bureau's broad index of raw materials prices has fallen to its lowest in 12 years - below even its level at the trough of the Great Recession of 2008/2009.

The upshot is headline inflation rates are likely to remain depressed for far longer.