To implement the first-best production levels, the principal can make the following
take-it-or-leave-it offers to the agent: If θ = ¯θ (resp. θ), the principal offers the transfer
¯t∗ (resp. t∗) for the production level ¯q∗(resp. q∗) with ¯t∗ = ¯θ¯q∗(resp.t∗ = θq∗). Thus,
whatever his type, the agent accepts the offer and makes zero profit. The complete
information optimal contracts are thus (t∗, q∗) if θ = θ and (¯t∗, ¯q∗) if θ = ¯θ. Importantly,
under complete information delegation is costless for the principal, who achieves the same
utility level that he would get if he was carrying out the task himself (with the same cost
function as the agent).