Dynamic allocation is a network-wide feature that allows Open Auction bids to compete in real time with guaranteed and remnant line items. Competition occurs on an impression-by-impression basis and does note compromise delivery or revenue of guaranteed line items.
Customized numeric priority values
Some networks can change numeric priority value of line item types. Changing the priority value can adversely affect ad selection and is not recommended.
House line items and the auction
House line item CPM determines ranking of eligible House ads but do not need to meet any floor price set in unified pricing rules in order to be eligible to serve an ad, thereby effectively serving as a fall-back ad. Learn more
The following Google products can serve ads to Ad Manager networks using dynamic allocation:
- Ad Exchange: Demand can come from a number of large third-party ad buyers, including Google Ads and other buyers participating in the real-time bidding exchange, which may include Preferred Deals and Private Auctions.
- AdSense: Provides fewer controls and more straightforward management. Demand can come from a number of large third-party ad buyers, including Google Ads and other buyers participating in the real-time bidding exchange.
- Line items with delivery goals: Line items that have delivery goals, either an absolute impression/click goal or a percentage of delivery. These include Sponsorship, Standard, Network, Bulk, or House line item types.
- Line items without delivery goals: Line items that compete on the basis of CPM but do not have delivery goals—that is, they have unlimited delivery goals. These include Price Priority, Ad Exchange, and AdSense line item types.
- Guaranteed line items: Sponsorship and Standard line items, which fall in the priority range of 1 to 11
- Remnant line items: Price Priority, Network and Bulk line items, with a priority 12
- Ad Exchange line items: Also with a priority of 12
- House line items: House line items have a priority of 16
Dynamic allocation allows Open Auction bids to compete in real time with guaranteed or remnant line items. Competition occurs on an impression-by-impression basis. You can control which inventory is eligible to compete via a combination of Protections, URLs, and unified pricing rules. Since dynamic allocation is active across your entire network, you don’t need to change any network-wide configurations.
If you only have remnant line items competing with an eligible Ad Exchange line item, Ad Exchange competes in real time with the highest CPM of the remnant line items that haven't reached their goal (absolute or by percentage).
If you have guaranteed line items of a higher priority (numerically lower or equal) than the eligible Ad Exchange line item or Price Priority line items, dynamic allocation can evaluate and set the reserve price as a temporary CPM or "opportunity cost" in Ad Exchange without causing under delivery of the guaranteed line item. This allows Ad Exchange or remnant line items to serve when they pay more than the opportunity cost of not serving the guaranteed line item.
Determining whether Ad Manager or Ad Exchange serves an ad
If the ad server determines that an Ad Exchange line item is eligible to compete for an impression, Ad Manager goes through the following steps to determine whether the Ad Exchange or the Ad Manager-booked line item should serve an ad.
Steps of dynamic allocation
|Step 1||There's an ad request to Ad Manager|
|Step 2||Ad Manager finds the best guaranteed line item eligible to serve for the ad request and calculates a temporary CPM based on the line item's current delivery|
|Step 3||Ad Manager finds an eligible remnant line item with the highest CPM|
|Step 4||Ad Manager calls Ad Exchange to find ads which can beat the temporary CPM of guaranteed line item or the CPM of the remnant line item|
|Step 5||Ad Manager selects the line item with the highest CPM to serve an ad, protecting guaranteed ads in all cases|
Ad Manager finds the best guaranteed line item eligible to serve for the ad request and calculates a temporary CPM based on the line item's current delivery.
Selection of the best guaranteed line item is based on many factors, including line item priority and how close each line item is to being on schedule. Learn more in the Ad selection white paper.
For example, we'll designate the best guaranteed line item as Line Item A.
Ad Manager creates a temporary CPM for Line Item A. This value can be thought of as an opportunity cost based the line item's progress and Ad Exchange historical bid data, to optimize publisher revenue. In general, the lower a line item’s Satisfaction Index (SI) (that is, the more behind schedule it is), the higher the temporary CPM that’s passed to Ad Exchange. Dynamic allocation uses this temporary CPM value to allow Line Item A to compete against eligible Ad Exchange and remnant line items in Step 2, competing with other sources.
Lower-priority remnant line items and Ad Exchange line items do not compete when either of the following are eligible to serve: a Sponsorship line item with a goal of 100% or a combination of Sponsorship line items at the same priority with goals that add up to greater than or equal to 100%. Similarly, Ad Manager may prevent lower-priority remnant and Ad Exchange line items from competing if Line Item A is a guaranteed line item that is at risk of not delivering in full (for instance, if Line Item A is far behind schedule).
Otherwise, Ad Manager looks at remnant/non-guaranteed and Ad Exchange line items eligible to serve to the same impression:
- If there is no remnant or Ad Exchange line item eligible, Ad Manager serves Line Item A and serving is complete.
- If there are several contending remnant and Ad Exchange line items, Ad Manager ranks all eligible remnant line items by their value CPM. It chooses the highest value remnant line item, which we refer to as Line Item B for brevity. If there is no value CPM, Ad Manager uses the line item CPM instead.
- Among eligible Ad Exchange line items, the highest priority (lowest priority number) line item is selected. If two or more Ad Exchange line items have the same highest priority, then one is chosen by Ad Manager.
Ad Manager then calls Ad Exchange (using the selected Ad Exchange line item) to see if it can provide a bid with a higher price than both the temporary CPM of Line Item A and the value CPM of Line Item B. Calling Ad Exchange only means that Ad Exchange gets a chance to compete with Ad Manager; it doesn't necessarily mean that an Ad Exchange ad gets served (see Step 3 for that).
If Ad Manager calls Ad Exchange in Step 2, eligible Ad Exchange ads compete with Line Item A and Line Item B on a CPM basis. The reserve price for Ad Exchange ads is at least the maximum of the temporary CPM from guaranteed Line Item A and the remnant value CPM from Line Item B. (The reserve price may be higher than this maximum due to other publisher configurations, such as rules.)
- If an Ad Exchange ad can beat the reserve price (at least the maximum of the remnant value CPM from Line Item B and the temporary CPM from guaranteed Line Item A), then that Ad Exchange ad serves.
Any Ad Exchange ad selected to serve still adheres to the conditions of Preferred Deals or Private Auctions, if applicable.
- If no eligible Ad Exchange ad can beat the reserve price, Ad Manager fills the impression with the line item that provided the highest CPM in Step 2: Either Line Item A based on its temporary CPM, or the remnant Line Item B that provided the maximum CPM.
When we refer to the CPM of an Ad Exchange ad, that CPM is on a net basis to the publisher (that is, it takes into account Ad Exchange's revenue share).
Your network is enabled for dynamic allocation and you use Ad Exchange with the default settings. When a visitor stops by your site, an Ad Exchange line item is eligible to serve to the impression, as are a number of guaranteed line items. The best guaranteed line item is at priority 10. With dynamic allocation, Ad Manager looks at all the eligible guaranteed line items and calculates a temporary CPM for the winner. The winning guaranteed line item is late on delivery. The temporary CPM is calculated as $6.50.
There are 2 other remnant line items with CPMs of $3 and $5, respectively. Ad Manager sends the maximum of the temporary CPM ($6.50) to Ad Exchange. As it turns out, there’s no eligible Ad Exchange ad that can beat $6.50, and so the guaranteed line item fills the impression.
General notes about dynamic allocation
- Note that the dynamic allocation process protects delivery of guaranteed line items by dynamically adjusting the temporary CPM. Therefore, a guaranteed line item that is behind schedule wins often enough to stay on pace to satisfy its goal and pacing settings. If the temporary CPM is too high, Ad Manager doesn't make the call to Ad Exchange, which explains why sometimes the number of "Impressions competing" is lower than the "Eligible impressions" in the Ad Exchange opportunities report.
- Since Ad Exchange ads compete with remnant line items on a CPM basis, the dynamic allocation process maximizes publisher yield regardless of demand source.
- By dynamically allowing competition between Ad Manager guaranteed line items and remnant line items/Ad Exchange ads (when the latter have a sufficiently high bid), Ad Manager maximizes efficiency and increases publisher yield/advertiser value compared to a static allocation/“waterfall” system.
Some network may have configurable priority values enabled. This feature allows users to change the numeric value of a line item type. For instance, the Ad Exchange line item type has the default priority value of 12, but with configurable priorities, users can change the value to of an Ad Exchange line item to 4.
Use of this feature is recommended only for exceptional cases as it can have unintended impact on ad serving and revenue.
Guaranteed line items may be impacted if priority is changed
Guaranteed (Standard or Sponsorship) line items may be impacted by this rule if Ad Exchange line items are set to a priority value above them. Changing priority so Ad Exchange is higher prevents dynamic allocation from taking line item pacing into consideration and can cause delivery issues for guaranteed line items.
Consider the following:
- Line items with a lower priority than that of the Ad Exchange or Price Priority line item are considered remnant inventory and compete based on price, rather than a temporary CPM.
- Price Priority line items with a custom priority can change the priority level where other line items are considered remnant or guaranteed, but this only applies when an Ad Exchange or AdSense line item is also eligible.