a different form of mafia-type game?

[verge_of_taboo]

since i've become hopelessly addicted to mafia, and can only involve myself in so many games at once before they all melt together in my head, i was thinking about the possibilities of another logic+strategy+human nature sort of game to play here or the brunchma forums.

i was thinking something along the lines of stock trading or monopoly, but can't think of ways to make it work. help?