Problems of wealthy possible futures will be valued over problems of poor possible futures. The future philanthropy Hedonism Bots for People Who Can Afford Only 7 Hedonism Bots will pay billions for a Certificate of slightly improving the Orgasmotron. The future philanthropy Zombie Control Initiative can barely afford to give a holder of the Certificate of Inventing the Vaccine against the Z-virus one of the last remaining can of spam. Current market prices of those two certificates will reflect their future value.
EDIT: I now think the thesis of this comment is incorrect
I don't think this is true. Suppose world A is rich and world B is poor. People want resources more in world B, so they are not willing to pay as many resources for a certificate. But on the flip side, a philanthropist is happy to accept fewer resources. That is, a resource that pays $1 (real) in world B, costs more than a resource that pays $1 (real) in world A, because it's catastrophe insurance. This seems to exactly offset the decreased willingness to pay of people in world B.
(Of course, wealthier worlds might also devote a larger share of their resour...
Paul proposes that we could create a market for certificates of impact. The certificates would be created whenever someone does something that has a positive impact in the world.