Incentive-compatible
Contract that gets the agent to make intended choice
Adverse selection problem
Worst agent typos are the ones most eager to transact with the principal
Asymmetric info problems
Particularly severe with contracts like warranties and insurance
What helps the monopolist solve moral hazard problems
Having consumers compete in auctions
Who makes the first mov in a signalling game
The player with private info about its type makes the 1st move
Moral hazard
The best hidden action for the agent may not be good for the principal