Earlier quoted context omitted.
No, the 1920-21 was.
If you're counting peak annual rate rather than total deflation then part of 1920-1921 was worse than 1929-1933, but if we're talking about momentary deflation then neither was the worst deflation in US history. see http://en.wikipedia.org/wiki/File:US_Historical_Inflation_An...
Can I rant a bit? Thanks again. It'll be about deflationary blips and deflationary spirals.
Have you ever noticed that the definition of a deflationary spiral self-contradictory? You know how it goes, people hoard money in order to spend them later, but when that later comes they do not spend them but continue to hoard even more in order to spend them later-later. Then later-later-later. Then... Well, the endgame is that everybody dies and zombies take over the earth. (Zombies are immune to hoarding, it seems)
Do people really act like this? Because if at any step of such an iteration the people will start spending (and the low prices and increases money balances will provide for an excellent temptation) then the vicious circle is broken, the spiral is no more, and we are contemplating here a deflationary blip. Or event if blip doesn't sound reputable enough.
Looks to me like a totally legit process. Exactly what the Walras Auctioneer will do in his search for a price equilibrium.