Reception follows.

Even for those among us who are not altogether convinced by Isaiah Berlin's famous essay "Two Concepts of Liberty," it has by now become commonplace to adopt a distinction between "negative" and "positive" liberties that largely coincides with the one he offered. In my lecture I defend the thesis that this bifurcation of the concept of freedom is incomplete in a significant respect, because it omits a third type, which I will call "social freedom." I proceed first by illustrating with some well-known examples how we must understand this third form of freedom, which cannot be performed by one subject alone, but rather requires the cooperation of others. In the second step I want to recall briefly the philosophical tradition in which this idea of "social freedom" has always had a central place. Finally, I delve into the systematic question of whether the suggested model of freedom in fact designates a third concept, which does not conform to the traditional bifurcated understanding.