Our mechanism's efficiency is within a constant fraction of the a posteriori optimally efficient solution. Our mechanism's technical core is
a variant of the net weighted bipartite matching drawback the place
not like prior variants through which one randomizes edge arrivals or bounds edge weights, we might revoke previously committed edges.
Further, it bounds the earnings of speculators who're in the game to obtain the cancellation fees.
Our model permits the seller to cancel at any time any reservation made
earlier, in which case the holder of the reservation incurs a
utility loss amounting to a fraction of her worth for the reservation and might also obtain a cancellation charge from the vendor.
They nonetheless hold if we exchange items with components of a matroid and
matchings with independent units, or if all bidders have additive value for a set of objects.
A vendor will display a set of slots at some point T in the
future. Many advertisers (bidders) use Internet programs to buy
show commercials on publishers’ webpages or
on traditional media similar to radio, Tv and newsprint.

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