Question: A media buyer is participating in a bidding environment where the clearing price is determined exactly by the highest submitted offer. How does this specific dynamic influence the buyer's optimal bidding strategy?
- It encourages the buyer to bid their true maximum value for the impression.
- It incentivizes the buyer to bid slightly above the estimated next highest offer.
- It makes sure the buyer pays the second-highest price regardless of their bid.
- It allows the buyer to pay a variable floor price set by the supply-side platform.
Explanation
In a first-price auction, the winning buyer pays the amount they actually bid, not the next-highest bid. Google’s Display & Video 360 documentation states that non-guaranteed auctions can be first- or second-price, and that inventory goes to the highest bid above the minimum CPM. Google Help Because the clearing price equals the submitted bid in this auction type, bidding the full private valuation can overpay relative to the competitive threshold needed to win. That is why the rational strategy is bid shading: bidding just above the estimated next highest offer rather than bidding the full maximum value. Google Help+1
Why the other options are incorrect
variable floor price describes a supply-side constraint such as a minimum CPM, not the buyer’s optimal response when the clearing price equals the top submitted bid. Google Help
true maximum value fits a second-price logic more closely, because in a first-price environment the winner pays their own bid and may overpay if they bid their full valuation. Google Help
second-highest price is the defining mechanic of a second-price auction, not a first-price auction where the highest submitted bid sets the payment. Google Help
Source for verification
Display & Video 360 Help: About non-guaranteed auctions. Google Help
Display & Video 360 Help: Automated bid strategies. Google Help
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