All agree that the consumer price index (CPI) is biased and overstates inflation. In 1996, economists hired by the Senate Finance Committee estimated that the U.S. CPI overstates annual inflation by 1.1% (Boskin et al. 1996). That estimated CPI bias has not gotten smaller with time. It is now up to 1.5%, even 2%.
The main biases in the consumer price index everywhere come from how to handle changes in the quality of goods and services and how to deal with completely new goods and services.
I thought I might see what happened if I took account of this one and a half percentage point annual bias because of new goods, quality variation and other known biases in the CPI estimates for the USA, UK and Japan in the relevant OECD StatExtract database for annual CPI inflation.
Source: OECD StatExtract.
Taking into account new good and quality bias, Japan is been in serious deflation for quite some time now – at least 20 years. Japanese inflation went positive in the last year or two because I believe they increased their consumption tax.
The USA has a low inflation for about 20 years. The UK had no inflation for about seven years from 1997 then it started to rise again until 2012.
People get hot and bothered with deflation. Breathless journalism aside, fears of inflation are just a legacy of the great depression in the 1930s.
The only depression where deflation was accompanied by mass unemployment was the Great Depression. Mild deflation with good growth is a common phenomenon as Atkinson and Kehoe found:
Are deflation and depression empirically linked? No, concludes a broad historical study of inflation and real output growth rates. Deflation and depression do seem to have been linked during the 1930s. But in the rest of the data for 17 countries and more than 100 years, there is virtually no evidence of such a link.
Utopia, you are standing in it! 
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