Quote from xenix:
My timing has always sucked but I'll give it a stab. And if you want to make fun of me later when I'm wrong, I'll just point to this caveat.
I don't think the multiplier will pick up until there is an increase in economic activity. The problem is that this could come from many different sources - some quite unexpected. You may have read that China will be spending down their foreign reserves. Depending on how much of that money they spend in the US economy, that single action could have a dramatic affect and sharply accelerate any proposed time table.
Another consideration is when the bulk of the Obama stimulus will be spent. Since the lag could be as much as a year, if not more, and since it maybe 2010 before most of it is out the door, you might not see any pressure on the multiplier until late 2010 at the earliest.
So to even attempt a prediction, you need to have a handle on current conditions and I seriously doubt if anyone does.
Even so, I'll say that the multiplier will gradually increase but that it will be at least 4 months before you see it increase at an increasing rate. Long before that the fed will implement contingency plans to manage the excess liquidity - such as the proposal to pay interest on excess reserves. This will make it more nimble in responding to events as they unfold.
They will ignore the initial changes in economic activity as long as they are not striking. I would expect that during the Christmas shopping season - Nov-Dec. So the first actual tightening will probably occur in February.
edit - some of this analysis is not entirely consistent. It sounded good as I was typing it, but didn't hold up upon reflection. I'll have to come back to it. But let me know what you like and don't like.