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Identical Adsense ad units?

11:10 pm on Jan 29, 2019 (gmt 0)

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joined:Nov 29, 2015
votes: 22

Let’s say I have a 728x90 leaderboard ad unit. Default settings. Call it “Ad1”

I run it on my site for 6 months.

Assuming it’s making $10 a day. $0.11 a click.

If i replace “ad1” with an identical ad unit - same size, same settings, call it “ad2”

Why would “ad2”’earn less then “ad1” did?

Thanks for helping me understand the inner workings of Adsense.