Re: Questions regarding placement of advertising when using adwords-what determines where ad is loca
In a word, Quality Score. Ok, that's two words. There is a certain minimum quality score that must be achieved to appear at the top of the page. Google does not disclose exactly what the requirement is. AdRank alone won't do it, so upping your bid won't help much.
What's the main factor in QS? CTR. What you can do is try to increase the CTR so your QS will go up and your ad can become eligible for top of page listing.
Best of Luck!