The core US inflation rate or Producer Price Index (PPI) — a measure of the prices of goods excluding food and energy  — rose 0.4% in April, double the increase forecast by economists.

This puts the core US inflation rate up 3% in the past year, the biggest year-over-year rise since late 1991.

The PPI figures are unlikely to affect the markets which, according to a report by MarketWatch, “don’t seem to trust the government’s inflation figures that show falling energy prices in a world of record crude oil prices.”

The government’s data are seasonally adjusted to hide the impact of normal seasonal variations to focus on fundamental changes in prices that are not driven by the ebbs and flows of the seasons. Because energy prices typically rise more in April than they did this year, the seasonally adjusted figures showed a 0.2% decline. In unadjusted terms, energy prices rose 2.9%.

“Since the beginning of the credit crisis last summer, Fed policy has been purely inflationary,” says Bill Bonner in The Daily Reckoning, “intended to convince people that they had more money and credit than they thought…and that they should spend it and invest it. But that policy can’t work forever. Eventually, consumer prices rise sharply. Then, the game is over…the Fed has to ‘lower inflation expectations’ before it can inflate again. The hocus pocus only has a positive effect, in other words, as long as people are misled…once they catch, the jig is up.”

And on a global scale, “rising raw material prices, in particular rising food prices, are now causing real hardship and what represents a cause for shoppers in developed economies to grumble is a matter nothing short of life and death for the millions less fortunate around the world,” says Money Week editor Merryn Somerset Webb.