How to increase cpi

To increase your cpi(cost per impression) and cpa(cost per action ) you should provide a valid site which has more content to reach the user and stick user to your site.So now by providing site contents you will get more visitors and impressions are increased .
To get clicks you should provide a better ad banner which should attract the visitors to click your impressions.I think this will be helpful to you..If you got these point reply..