You once suggested that in order to test target CPA, we should never touch the main campaign. Instead, we should make a copy and test it. Yes, that's true. In this situation, when we test the target CPA in a copied campaign, should we pause the original campaign altogether? No, never do that. Why are you touching the original one? Let it run. It has nothing to do with the new test at all.
Some people create experiments and all that, but we prefer to just make a new campaign because if it's not working, we can easily switch it off. Will it affect the efficiency of the original campaign? No. If you are bidding aggressively on the new one, then it may take a certain amount of impression share from the original one. So, it depends on how aggressively you are bidding up or down compared to the original campaign.
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