Margaret Gilbert and the fragile reality of ‘us’
What does ‘going for a walk together’ mean? Two people walk in the same direction. They walk side by side, at the same pace, perhaps along the same path. Can we say they are going for a walk together? Not necessarily, because two people can also walk next to one another without necessarily ‘going for a walk together’. They may coincide in space, in time, in movement, even in their destination, and yet remain two separate agents. For the difference between walking in the same direction and going for a walk together, then, does not lie in behaviour observable from the outside, but in the internal structure of the relationship. Walking together does not simply mean moving one’s bodies in a coordinated manner. It means being engaged in an action that each person understands as ‘ours’.
Margaret Gilbert’s line of reasoning, set out in her important work *i* *On Social Facts* (Princeton University Press, 1989), begins with an attempt to answer Georg Simmel’s famous question: ‘What transforms a collection of living human beings into a community?’. This is a question that is abstract only in appearance. In reality, it permeates every aspect of our shared life. What makes a family a family, a group of friends a group of friends, a town council a decision-making body, and a community a people? Physical proximity is not enough. Nor is similarity enough. Not everyone with green eyes, not everyone living in the same neighbourhood, not everyone who desires the same thing, automatically forms a community. Something different is needed: a normative connection, a form of shared self-understanding, a way in which certain individuals begin to think of themselves as parts of a practical unity, a ‘plural subject’, as Gilbert defines it.
Over the past few weeks, we have seen how Martin Hollis has shown that cooperative action cannot always be understood in terms of the rationality of the isolated self, and how David Lewis has grounded conventions in equilibria of mutual expectations. Gilbert follows on from this, along the same lines – he acknowledges the importance of expectations, shared beliefs and coordination – but believes that social life is not merely a sophisticated game of mirrors in which each person observes the other whilst the other observes them. There is a deeper level, which concerns not only what each person individually believes or prefers, but what certain individuals have committed to together.
More than the sum of its parts
Her theoretical target is what we might call ‘methodological singularism’ – the thesis that concepts of collectivity can only be explained in terms of singular agency, consisting of separate individuals, each with their own ends, beliefs and intentions. This is the familiar world of rational choice theory, but also of a certain Weberian-style sociology. The philosopher does not, of course, deny that every collective is made up of individuals, but she argues that individualism, if it is to be realistic, must recognise that individuals can take on a specific relational form. They do not cease to be individuals, even whilst becoming, in certain circumstances, members of a plural subject.
The example of the walk is revealing. Let’s imagine Anna and Bruno. Anna wants to go to the park. Bruno wants to go to the park. Both know that the other wants to go there. Both know that the other knows. They walk side by side. This description is still compatible with two parallel individual routes. For it to be said, in the full sense of the term, that they are going for a walk together, a further element must be present: each must have expressed to the other their willingness to take part in a shared activity, and this willingness must be mutually recognised. From that moment on, if Anna stops without saying anything, Bruno can legitimately ask her: ‘What are you doing? We were going together.’ He is not simply expressing a disappointed preference. He is asserting a claim. The ‘we’ has created a right of expectation and a corresponding obligation. For Gilbert, therefore, a plural subject arises only when several people openly express their willingness to enter into a shared commitment under conditions of shared knowledge. It is not enough for each person to have, on their own, an intention similar to that of the others. Nor is it enough for each person to know that the others have that intention. It is necessary for each person to know that the others have expressed a willingness to enter into that commitment together, and for this knowledge to be shared. This is the structure of common knowledge, which is drawn upon by game theory and Lewis’s treatment of the subject. But whilst for Lewis, common knowledge helps to stabilise the convention, transforming it into an equilibrium in the coordination game, for Gilbert it helps to establish the plural subject. The terminology may seem technical, but the experience is an everyday one. Two colleagues say to each other: ‘Let’s write that report together.’ Two friends: ‘See you tomorrow at seven.’ Two citizens: ‘Let’s set up a committee.’ A couple: ‘This year we’re going on holiday to the mountains.’ In each of these cases, we do not merely have compatible individual intentions. We have a joint commitment. From that moment on, neither party is free to behave as if nothing had happened. Not because an external authority has imposed a penalty. Not because a contract has been signed, but because a bond has arisen within the relationship itself. Gilbert describes it, drawing on a Rousseauian image, as a pool of wills, a union of wills.


