If one wants to evaluate alternative political policies, institutions or even complete constitutions on the basis of their consequences, one does not need to thoroughly evaluate their consequences and one does not need to know completely what their consequences are. Let us suppose then, that the role of economic theories and game theory in particular is mainly to assist us to interpret information we already possess, or that we can acquire at a small cost what the consequences will be.
“It is, therefore, a just political maxim, that every man must be supposed a knave; though, at the same time, it appears somewhat strange, that a maxim should be true in politics which is false in fact. ”
(Hume 1741, pp. 40-42)