I am not sure economists are your best bet. (or perhaps I am confusing them with bean-counters). In my experience, the advances that the open approach are likely to bring are exactly the things they are unable/unwilling to measure and is part of the reason we are in the mess we are in now. This is because it is nothing that is usually measured directly (although you make a strong case for those things that can be seen as direct output) but are synergistic outcomes from random events. We're having enough trouble understanding these things in molecular systems, much less with people!

And in my monday morning disaffectedness:
If we can achieve qualitatively more science for the same money then working with business minded funders to help them increase their impact may well be the way forward.

Or they will just give us less money.

I think the principles are right, but there are still some holes that need to be filled. Unfortunately if I knew how to do it, I already would have. :)

Are there some values/economics that have been done for the Opensource community? This might be a good starting point.