[Symmetry]

I thought that the current mainstream economic view was that inflation, rather than lagging the quantity of money, actually reacted to people's expectation of how much the money supply would increase in the future. That was certainly the case a little while ago when the Swiss central bank announced they wouldn't allow any more appreciation in the Frank, and that they would print more Franks until they had reached the peg they wanted. The exchange rate hit their target within 15 minutes of the announcement.

EDIT: Wikipedia has a very good article on inflation, and I think that it would do most people a lot of good to read it and understand the various reasons people care about inflation, and where different schools of economics differ on it. http://en.wikipedia.org/wiki/Inflation