Why "Estimated Avg. CPC" changes when using multiple phrases in Google's Traffic Estimator?

Posted by Misha Moroshko on Pro Webmasters See other posts from Pro Webmasters or by Misha Moroshko
Published on 2011-11-22T10:52:24Z Indexed on 2011/11/22 18:16 UTC
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I use Google's Traffic Estimator to calculate the Estimated Average Cost Per Click.

I use the following filters:

Locations: Australia
Languages: English
Max CPC = $10000 (just for this example)

When I enter the following phrases:

air conditioner melbourne
air conditioning melbourne

the result is:

air conditioning melbourne: AU$6.53
air conditioner melbourne:  AU$5.97

But, when I use a single phrase:

air conditioner melbourne

the result is:

air conditioner melbourne:  AU$6.22

Why is this difference?

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