BS. The natural rate of inflation is slightly negative as people become more efficient and better tools are made. Anything above that is the government and bankers sticking their hand in the till.
A short spell of deflation driven by cheaper oil
More BS. Inflation is a creation of either over production of money or a fixed money supply with a decreasing total production. Supply shocks, neither positive or negative, are not deflationary nor deflationary. They may decrease or increase prices, but that is not inflation. This argument is like saying the drop in price in electronics(compare $500 for my first 32 MB drive to about $60 for my most recent 128 GB flash drive, or an annual deflation rate of 32% not even count increases in speed or convenience) is bad.
Too many economists confuse deflation in a collapsing economy with the natural deflation from productivity increases and think that since the first is bad (although a secondary effect) that the second is also bad.
Sounds we're got different inflation definitions; maybe we'd be get more done if we picked one and went from there. Here's one that most folks are already using:
inflation (ɪnˈfleɪʃən)n
(Economics) a progressive increase in the general level of prices brought about by an expansion in demand or the money supply (demand-pull inflation) or by autonomous increases in costs (cost-push inflation). Compare deflationCollins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003