It does make perfect sense. Can you post some references for us if possible?
> The behavioral model that seems to have
>most validity is not utility maximization, but transaction cost
>minimization.
But aren't you sort of throwing away the social connection part, as above, when you focus on "minimizing costs"? Sure, there are costs in all that we do, but when it comes to social connections, I'm not so convinced that "costs" are the first considerations that come to mind. Of course, both models are inadequate, but it may be more appropriate to view social connections as something that affects "utility" (well-being, happiness)...for modelling purposes that is.
Diane