Oops

Basically, and as Bloomberg reports, when the Riksbank raised interest rates in September 2008, 11 days before Lehman Brothers collapsed, Sweden’s central bankers based their decision on inflation figures from the Statistics Office. Unfortunately, later that month four months of inflation data had to be corrected after the Office discovered that a computer inaccurately calculated a 28 percent increase in shoe prices (although the problem, I imagine, lay with the person who entered the data, rather than a malfunctioning computer). As Cecilia Skingsley points out, apart from the impact on central bank monetary policy, “The shoe adventure meant we ended up with a different price base amount, which in turn affected benefit payouts.” In fact Bloomberg estimate that the mistake cost the government something over 600 million kronor ($84 million) in excess benefit payouts.

"Lies, Damn Lies And Statistics In Sweden (of all places)", A Fistful of Euros