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                <term xml:lang="en">Ascending Auctions.</term>
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                <term xml:lang="en">Nonexclusive</term>
                <term xml:lang="en">Discriminatory Pricing</term>
                <term xml:lang="en">Entry-Proofness</term>
                <term xml:lang="en">Adverse Selection</term>
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              <p>This paper studies competitive allocations under adverse selection. We rst provide a general necessary and sucient condition for entry on an inactive market to beunprotable. We then use this result to characterize, for an active market, a unique budget-balanced allocation implemented by a market tari making additional tradeswith an entrant unprotable. Motivated by the recursive structure of this allocation, we nally show that it emerges as the essentially unique equilibrium outcome of adiscriminatory ascending auction. These results yield sharp predictions for competitive nonexclusive markets..</p>
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