Earnings is not by click
Yes, it is.
Is not by every click like people thinking ( is some percent of clicks)
So... is not by click
In many clicks you will not get notihng ...google calculating just some of clicks
So.. is like not by click
Earning is by showing interest for product displayed on your website through adsense account
If google decided that some click not show enough interest so google will just ignore it
So.. you can have example 5000 visits and only 100 clicks... this is not real... real is more clicks but google calculating only clicks from people who are really interested in products in image or text displayed in adsense on your website
You will never know how in real was number of clicks...
So... is earning by clcik? think about... maybe name for this can be better "earning by decided click or no... from google"
If you have website with only return visits and not new visits .. even can be more of 2000 visits per day to your website but imagine only returned visits... and from google search zero visits ... in this case you will earn almost zero
because no chance that same people will have interested for clicking all time in your website .. So is not by click
is by interest... for google is not important click if that visit are not really interested in this what click... and google very easy discovering it
So... is earning by interest...
Google always doing sure in way that only people who coming from google search can bring some money to you like real visitor for adsense
Other source is not valid for google or is much less valid
Website what have same "public" (visitors) all time will not earn much from adsense or will earn just minimum even if many people coming in that way
Goolge want all time some percent of new visitors to your website ... return visitors are just for show reputation of website but not for earning money
If you have forum with maybe 100 000 people and they coming to your website directly... and regulary every day... and not anybody from google search or some minimum people ,... so in this case you will earn minimum...very minimum..even if they clicking you wil not earn some important money
Now are mostly visits from mobile devices... so in this case for google is more easy detect real visitors interesting for some things... all is perosalized now.. android is from google...google know about every visit how many years have and number of shoes...and what movies watching... what music listening... what kind of ciecream like.. what restaurants visiting... google know all about you
Artificial inteligency discovering what you will maybe do tommrowow..
ALL is by INTEREST
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