# What is the maximum average CPM per line with the “Budget”“Minimum CPM” and “Average CPM” strategies?

The maximum average CPM is the upper price limit for the entire line period. This limit applies to the entire spent budget, which is divided by the number of impressions (in thousands). This means that the algorithm is designed to spend the budget so that the actual CPM for the whole line does not exceed the upper limit.

Note.

Prematurely stopping the ad campaign may mean that the specified parameter can not be implemented during the corresponding time interval.

## Example

Initial data:
• “Budget” strategy
• Line period: 3 days
• Budget: 30,000 RUB
• Maximum average CPM: 100 RUB
Check:
1. Line sales.

During the first day, 10,000 RUB were spent and 125,000 impressions were purchased. Actual CPM is 10,000/125 = 80 RUB

During the second day, 10,000 RUB were spent and 98,000 impressions were purchased. Actual CPM is 10,000/98 =102.04 RUB

During the third day, 10,000 RUB were spent and 90,000 impressions were purchased. Actual CPM is 10,000/90 = 111.11 RUB

2. Checking the “Maximum average CPM = 100 RUB” criteria.

The part of the budget spent is 10,000 + 10,000 + 10,000 = 30,000 RUB.

The number of impressions purchased is 125,000 + 98,000 + 90,000 = 313,000.

The actual CPM is 30,000/313 = 95.85 RUB.

Criteria fulfilled.