 One question—call it the identification question—concerns definition and identification: How can we identify which forms of influence are manipulative and which are not? A satisfactory answer would presumably involve a general definition of manipulation, which explains what the diverse forms of manipulative influence have in common. In addition to illuminating how the various instances of manipulation are manifestations of a single more basic phenomenon, an answer to the identification question should also provide criteria for determining whether a given instance of influence is manipulative. Such an analysis might, of course, show that some of the phenomena that we were pre-theoretically inclined to count as manipulation are relevantly different from clear cases of manipulation, so that we might be led to revise our usage of the term “manipulation.”