… However, in mechanism design problems with only one agent a revelation principle can
be formulated in terms of payoffs: Any payoff implementable by a deterministic mechanism
can at least be matched with a deterministic, direct mechanism that induces truthful
revelation. I show in an example that with more than one agent this result fails. As a
consequence, the structure … In this section, I show that if the mechanism designer is
concerned with only one agent, this is indeed the case and a revelation principle can be …