They wouldn't come to a consensus because the issues being considered are inherently based in subjectivity and experience.
Furthermore, the ends are not clear, either.
A disembodied ghost's opinion would be shaped by the biases fed to it as "fact".
yep
Well, what knowledge of economics do they receive?
Lets assume all All.
Continue.
Is that including historical background? If so, they have to receive a biased view as to how things actually transpired, what causes economic problems, etc.
The only way for them to not receive a biased view would be to actually see and know everything, in which case they would be godlike entities and that just makes the Original Position as worthwhile as asking "What would Jesus do?"