Custom Bids
Optimize your campaing's spend by setting custom bids on individual targets and/or sources. This tutorial explains campaign optimization with custom bids.
The key point of any optimization is rearranging your money flow from non-profitable to profitable placements. One way of achieving this is by setting a custom bid for any target/source in your campaign.
Benefits
Setting a custom bid on a given source or target will allow you to:
Receive more traffic from the source/target, if you raise the bid
Lower the price of traffic from the source/target, if you lower the bid
Hence, you have three options of source level optimization :
If you have great ROI on traffic from a given source, increase your bid to get more traffic.
If your ROI on traffic from a given source is marginally negative, lower the bid to pay less.
If a given placement does not perform at all, just pause it.
Modifying the Bid
In order to set a custom value for the bid, perform the following steps:
Go to the Targets / Sources tab.
Click the Auto button in the Your bid column. The cell switches to the editing mode.

Provide a custom bid for:
A target: It will override both, source and campaign bids.
A source: It will override the default campaign bid.
