Armies require grain to move and navies require oil. In addition, salaries must be paid for each army and naval unit. Each country on the board is capable of producing certain types of resources. Players can gain access to those resources by capturing the country in question and playing the appropriate resource card. Alternatively, players can buy or sell resources on the global market.
Supremacy is a more detailed version of the classic game Risk .
This is a very interesting game with some really nice components. Also, the mushroom cloud markers are just begging out to be used and so most games tend to wind up with everyone losing in a blaze of nuclear anhilation. Still, it can be a fun game to play.