Agency (n.) is a part of 'the multiplicity of force relations immanent in the sphere in which they operate and which constitute their own organization.
Agency (n.) is a subject position within discourse.
Agency (n.) is not the effect of the autonomous actor but constructed through mechanisms of social control.
Agency (n.) occurs only within particular structures, and thus concerns mechanisms of social control rather than individual autonomy.
Agency (n.) is complicated by the fact that people may know what they do, and they may frequently know why they do what they do, but what they don't know is what they do does.
Agency (n.) is made problematic by the fact that, when power is directly contested, it will just shuffle a bit and end up more stable and stratified than ever. Thus, effective agency lies not in resistance but in play (whether sexual or political play) which challenges society's rules on a deeper and less predictable level, opening up greater possibilities of change.
Agency (n.) is the interplay between the strategies of power and resistance rather than in terms of the self-conscious subject.