An Efficient Double Clock Auction

We provide a buyers´ bids double clock auction, by which all buyers have interdependent and almost common values while all sellers have private values. The quantity allocation and unit pricing for goods are determined by clock auction while the auctioneer determines the mapping between bidders and units, units and prices as well as units and pricing order numbers. Truth telling will be given priority in the auction mechanism, it is shown that each seller has a dominant strategy to set his reservation price equal to his true value for each unit he sells and each buyer has a weakly dominant strategy to bid with true value in the auction. The double auction is efficient and has an ex post equilibrium while sellers´ true values are low.