When should you reallocate your ad budget?

When you want to increase for high-performance/decrease for low-performance products or campaigns to optimize your budget or increase purchases
When you want to increase for low-performance/decrease for high-performance products or campaigns to improve overall performance
When you want to try different budget allocations to ensure your ad budget can cover a full day

The correct answer is:

When you want to increase for high-performance/decrease for low-performance products or campaigns to optimize your budget or increase purchases