Force and economic instruments are the major techniques states have at their command to translate power potential into power. Economic and military-strategic theorists have developed ways to analyze more systematically the choices states make and the probable outcomes. This method is called game theory. Game theory assumes that each state is a unitary actor with one national interest and has a unique set of options and stipulated payoffs associated with each of the options. The game is about strategic interaction and the interdependence of individual strategies.