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Our mechanism’s efficiency is within a constant fraction of the a posteriori optimally efficient resolution. Our mechanism’s technical core is a variant of the net weighted bipartite matching drawback where not like prior variants wherein one randomizes edge arrivals or bounds edge weights, we could revoke beforehand committed edges. Further, it bounds the earnings of speculators who are in the sport to obtain the cancellation charges. Our mannequin permits the seller to cancel at any time any reservation made earlier, during which case the holder of the reservation incurs a (...)