Consider the following scenarios and determine whether they demonstrate a strategic approach to budget allocation in digital advertising:
- Scenario 1: An ad set for a seasonal promotion of a clothing brand has a rigid budget that does not change, despite showing lower engagement rates than anticipated.
- Scenario 2: A campaign for a new skincare line allocates more budget to ad sets targeting demographics that have shown high engagement in past campaigns.
- Scenario 3: An online bookstore allocates the same budget to all its ad sets, regardless of the differences in the targeted audience segments’ past purchasing behavior.
- Scenario 4: A technology company adjusts the budget of its ad sets weekly, based on the conversion rates and customer feedback from the previous week.
Identify which scenarios represent effective budget allocation strategies in ad sets/groups.