Because of things like peak oil, growing resource demand from the developing world, etc., I think it's going to look like this for the immediate/foreseeable future:
Alternating cycles of inflationary bubble economies followed by deflationary collapse. Basically think 1995-2001 in .com or 2002-2008 in real estate, over and over again, forever. Inflation, deflation, inflation, deflation...
Beneath this alternating bubble-bust economy will be an underlying trend that I've heard called in-deflation: deflation in the value of everything you own, inflation in the value of everything you use.
Food, energy, and fuel in particular have nowhere to go but up for the reasons I mentioned at the top. Things like owning a car and driving it everyday are about to get orders of magnitude more expensive.
From a social point of view, the bubbles will serve a kind of bread-and-circuses role. Everyone will get to think they're going to get rich in the Next Hot Thing.