Earlier, I twittered: "Is it still called a placebo if the main effect is to trick the person administering the medication, rather than the person receiving it?". The specific scenario I was thinking of are aphrodisiacs: a company may market a particular substance as being an aphrodisiac despite the fact that that substance has absolutely zero effect on one's libido. However, you may believe in the power of this substance, and administer it (perhaps secretly) to some target. You falsely assume that the target's libido has been raised, and thus become more aggressive and self-confident, making advances you might not normally dared have made otherwise.

So is there already a term for this concept? If not, should we use the term "placebo" to refer to this concept, or should we invent some sort of new term for it?