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

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/bidding.proto)

| Fields ||
|---|---|
| ## `cpc_bid_ceiling_micros` | `int64` 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. |
| ## `enhanced_cpc_enabled` | `bool` 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. |