For XOS buyers with k copies per item, supply-based posted pricing obtains a 1-(k/(k+1))^k competitive ratio, and dynamic pricing obtains 1-O(sqrt(log k/k)).
As X(1) < k, we in fact sell X copies here and run out of copies for the first item
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Multi-Unit Combinatorial Prophet Inequalities
For XOS buyers with k copies per item, supply-based posted pricing obtains a 1-(k/(k+1))^k competitive ratio, and dynamic pricing obtains 1-O(sqrt(log k/k)).