A modified proportional mechanism for online auto-bidding achieves a price of anarchy of 1 + O(1)/(n-1) for liquid welfare, improving on the standard bound of 2.
Efficiency of the first- price auction in the autobidding world.Advances in Neural Information Processing Systems, 37:139270–139293
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Efficiency of Proportional Mechanisms in Online Auto-Bidding Advertising
A modified proportional mechanism for online auto-bidding achieves a price of anarchy of 1 + O(1)/(n-1) for liquid welfare, improving on the standard bound of 2.