Hi DavM,
You can use the Price estimation tool to see what the Avg. position would be for affected keywords. The higher the Avg. Position the more you may need to increase the bid price for that particular match type. Ad and keyword combination history may require higher or lower bids than those required of a new advertiser to obtain the same average position. For example, an advertiser might have to bid more than $0.05 even if the keyword research tool or price estimator found no data on the keyword.
If an ad/keyword combination does not meet several minimum thresholds, the ad will be displayed in a lower position, or not at all. Click-through Rate (CTR) is an important component of the checks to determine the thresholds. A low CTR indicates that users are not finding the ad useful. Please keep in mind that CTR is not the only measurement for relevancy, but there are a number of additional proprietary relevancy checks that are performed.
Please Note: price estimation tool is not specific to an account’s keyword history. The prices are a basic representation of what we would recommend for a bid to a new advertiser.
Microsoft adCenter will show one ad per advertiser per search engine results page (SERP). To help ensure the most relevant ad is shown, the display URL will be de-duped against other ads with the same display URL. Because only the most relevant ad will show, it is important that brand owners and affiliates work together to help ensure they use unique display URLs so that one of them is not de-duped.
The purpose of de-duping display URLs for ads shown in SERP is to provide the best experience for the searcher, which is key in maintaining a valuable audience for your ads.
Thank you,
Brian H - MSFT