 Second, it is not human beings per se but the “humanity” in human beings that we must treat as an end in itself. Our “humanity” is that collection of features that make us distinctively human, and these include capacities to engage in self-directed rational behavior and to adopt and pursue our own ends, and any other rational capacities necessarily connected with these. Thus, supposing that the taxi driver has freely exercised his rational capacities in pursuing his line of work, we make permissible use of these capacities as a means only if we behave in a way that he could, when exercising his rational capacities, consent to — for instance, by paying an agreed on price.