A bidding strategy where bids are a fraction of the advertised price for some good or service.
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 Maximum bid limit that can be set by the bid strategy. This is an optional field entered by the advertiser and specified in local micros. Note: A zero value is interpreted in the same way as having bid_ceiling undefined. | 
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 Adjusts the bid for each auction upward or downward, depending on the likelihood of a conversion. Individual bids may exceed cpc_bid_ceiling_micros, but the average bid amount for a campaign should not. |