Yesterday I earned 1.88$ (48 impressions) from 2 clicks but today i earned 0.87$(83 impressions) from 4 clicks is it normal or is it tht smart pricing?
It's normal. There are good days and bad days and whatever days. You can earn 100$ on day and $20 the next... It also depends on the market. Advertisers might not pay more per click depending on the season (like swimwear... no one will promote it during winter).
Yes it is normal, with so few clicks it is not possible to draw conclusions. Keep on working to get more visitors & more clicks, and then you'll start to see tendancies. But here, less than 10 clicks a day, it is absolutely normal to have variations. It is not smartpricing (yet!)