So Matt Riggsby's "GURPS Dungeon Fantasy Treasures: Glittering Prizes" came out recently (I was one of the playtesters) and it's useful for worldbuilders in general, not just those who play Dungeon Fantasy. (See here for Matt's Designer's Notes.) One of the things he included there was a cool little throwaway line:
"For example, if mystical techniques can easily store, combine, and subdivide magical energy – expressed as Fatigue Points rather than as weights of metal – that might from the basis for a currency in a highly magical society."Anders (who is forever asking interesting questions) asked the following in this post:
"So suppose there was a magicratic civilization that used materialized FP as currency. How much would 1 FP be worth?"