A bidding strategy where bids are a fraction of the advertised price for some good or service.
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.
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.