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Budget
Daily Budget
The amount a campaign is permitted to spend per day. Most platforms overspend it on high-opportunity days and underspend on others, balancing across a week rather than capping strictly at the daily figure.
Why it matters
Editing it resets learning on most platforms, so frequent tuning costs more in re-learning than it gains in control.
In practice
Set it with headroom and leave it. If you need tighter control, use a campaign-level cap rather than daily edits.
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