A number of readers have written to me in tones of polite reproach asking why I fret about deflation when governments everywhere are spending and printing as if there was no tomorrow. I admit to being tortured by self-doubt, like others grappling with this extraordinary situation.
What we know is that inflation is already negative in Ireland (-3.5pc), China (-1.5pc), Thailand (-0.9pc), Korea (-0.5pc), US (-0.7), Japan (-0.3), Switzerland (-0.3, Spain (-0.2pc). The eurozone may be negative by July. Alistair Darling said Britain's retail RPI inflation used to set wage deals will be minus 3pc by September.
Does this constitute deflation in a meaningful sense? Not yet, perhaps. But it is moving too close for comfort in a world stretched by extreme leverage. The economies of the US, Japan, the eurozone, and Britain have been contracting in "nominal" as well as "real" terms – which smacks of the 1930s.
The "yen GDP" of Japan has shrunk by 10pc in one year; the "euro GDP" of Germany has shrunk 6.2pc, and Italy's by 4.7pc ; the "dollar GDP" of the US has shrunk 3.3pc. Debts are not shrinking, however.
GMO's Jeremy Grantham says in his latest note, Last Hurrah And Seven Lean Years, that the market value of equities, houses and commercial property in the US reached $50 trillion in the boom. This "perceived wealth" sustained $25 trillion of debt.
The crash has cut this wealth to $30 trillion, but the debts are still there. America's debt-gearing has exploded, as it has in the UK and Europe. This looks awfully like Irving Fisher's "debt deflation" trap of 1933. It will be a long slog for households to bring their debt-to-wealth ratios down to manageable levels.