I guess I didn’t consider the iterated version of this—same group, many decisions, where it seems you can actually do something about the dishonesty: make people expose their actual forecasts of the variables in the group objective function; give more voting weight to those who are more accurate (about predicting the results of whatever choice is implemented).
Smells like the prediction markets suggestion of several other comments.
I guess I didn’t consider the iterated version of this—same group, many decisions, where it seems you can actually do something about the dishonesty: make people expose their actual forecasts of the variables in the group objective function; give more voting weight to those who are more accurate (about predicting the results of whatever choice is implemented).
Smells like the prediction markets suggestion of several other comments.