What happens when a campaign consistently meets its average daily budget?

Average CPC clicks will be lowered
Ads in that campaign will show less often they could
Your budget is automatically adjusted
Ads in that campaign will stop showing for the rest of the billing cycle

Explanation: If you have a limited budget, you want to make the most of every cent you spend on your advertising campaign. When your budget is limited, your ad might not show as frequently as you’d like — or might not show at all. Read more here

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