ABSTRACT
My aim in this paper is a modest one: I will present some constraints physical theories set on the disposition debate, by means of a particular example. I hope this example will not only shed light on the discussion, but also show that many dispositions rest on generic laws linking the macroscopic scale to the microscopic one. This fact, it seems to me, makes the debate about the nature of dispositions depend on a more general one about the various levels at which the material world is analysed in physics.
