Your client’s campaign is consistently meeting its average daily budget. What should you do to maximize your client’s budget throughout all hours of the day?
Increase the maximum cost-per-click (CPC) bid
Change the ad delivery method from “Accelerated” to “Standard”
Lower the daily budget amount
Pause the campaign to stop showing ads and accruing costs
Accelerated delivery tries to show your ads more quickly until your budget is reached. With this option, your ads can stop showing early in the day if your budget is spent.
Accelerated delivery is likely to use up your campaign’s daily budget early in the day. This is because accelerated delivery shows your ads until your budget is reached. “Standard delivery” is more optimized, which means that the delivery of your ads is spread more evenly throughout the day.
Read more here: //support.google.com/adwords/answer/2375418?hl=en