Regarding the tradability of Currency... Mr. President, you took the words right out of my mouth.
Actually, Poly might also net us Philosophy in addition to Math, if doen correctly. But, again, we have time. I would recommend to the Trade Advisor to allow the DP to check for trades every so often, moving in when A: we can get 2 techs for 1, or B: if things get antsy...
By "sell it", you meant Poly and not Monarchy, am I right, Dave? Because if you said Monarchy, please consider the Hanging Gardens... (Sistine I'm thinking is the "Make or Break" wonder of our Demo, but HG has some middle-term value...)