Why some time earning is fluctuating i don't know before 1 day i got 16 clicks and got earning 19 $ and yesterday i got 15 clicks and earning is just 5 $ i don't know what is happening i have got clicks from same location which is US and UK ... had impressions also very good and ctr is also 2.25 % every thing is fine but earning is decreased today why ... any suggestions !!!!
There are many reasons for it. Mostly they could not be guessed by you or I. Google decides it. So better leave pondering here and start looking from the other end.
Maybe Google just decided to keep more of your money. Thing is no one knows. Thats one big negative of using Adsense.