Where would I earn more in google adsense per clicks or impressions?

Question: would i earn more through impressions or clicks? also how can I change an existing ad box from clicks to impressions? Or should I just add another box beside it and set it to impressions?

Answers:
First, let me say BE CAREFUL... They'll disable your account for invalid clicks.
Now to your question. during my short stay with adsense. clicks were very good...so drive visitors to your site for your content/product...but do not advice visitors to click...and you cannot click on your adsense ad either.

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