You're wrong. AdSense pay per impressions + per clicks. I have used at the same time a-ads and Adsense on the same page, and I'm pretty sure that a-ads are nowhere near height and revenue opportunities which give AdSense
and for the earnings you can see on the rates of both they are $0.02 and $0.03 randomly on both for click.
Yes, i am sure. On my AdSense account i have earnings per impressions. I just checked the report for februar 2017 on my one experimental site where i have AdSense ads
I think they only pay the impression if they see the bouncerate being low.
The price per click I believe depends to the kind of niche the website has. I think more USD are paid to personal injury related niches for maybe about $24+ click. I remember back 2009 when creating wordpress blogs with 10 articles about personal injury already costs a lot when in bhw forum.
You are right. I think the major difference from which country comes clicks. countries where online payments are more common brings higher earnings per click