It Isn't Deflation Until We Say So
The Bank of Thailand insists it's just negative inflation
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Deflation is defined as a sustained fall in the general price level by the IMF, and is said to occur when the inflation rate falls below 0%.
Unless you are the Bank of Thailand. Consumer prices fell last month for the first time since Sept. 2009, but the central bank isn't too worried; they're just calling it "negative inflation" for now.