Abstract
Niklas Luhmann and Jacques Derrida start with a common assumption in their analyses of the law and the economy - the foundational paradox of social institutions. But then autopoiesis and deconstruction move into opposite directions. Luhmann pursues the question of how de-paradoxification constructs the immanence of social institutions and builds a world of autopoietic social systems. By contrast, Derrida's thought aims at the transcendence of social institutions through their re-paradoxification. However, there is a hidden supplementarity of autopoiesis and deconstruction which makes it worthwhile to relate the theories to each other. Derrida's distinction of writing/speech is necessarily blind toward Luhmann's distinction of consciousness/communication, but is, at the same time, continuously provoked by it. On another level, the opposite happens. Luhmann's autopoiesis is permanently irritated by Derrida's différance but is at the same time unable to conceptualize it. This complementary blindness of their distinctions directrices is a permanent source of mutual irritation which requires a reformulation of the social and of the possibility of justice.