The present mechanism lends itself to further extensions. First, the gap rule and bid targeting can be extended to auction settings with divisible goods and multi-unit auctions. Second, the implicit whistle-blowing tools, such as target bidding, can be used to preclude collusion in other mechanism design problems, such as the provision of public goods. In auctions, targeting is a way to dis- seminate information among bidders, thus it can be applied in common-value environments.