In theory, competitive emission permit markets minimise total abatement cost for any emissionceiling. Permit markets are often imperfectly competitive, however, if they are thin anddominated by large firms. The dominant firm(s) could exercise market power and increase otherfirms’ costs of...

The paper presents a complete information model of bidding in second price sealed-bid and ascending-bid (English) auctions, in which potential buyers know the unit valuation of other bidders and may spitefully prefer that their rivals earn a lower surplus. Bidders with spiteful preferences...