Possible Duplicate:
How does Google's Traffic Estimator calculate the “Estimated Avg. CPC”?

I use Google's Traffic Estimator to calculate the Estimated Average Cost Per Click.

I use the following filters:

Locations: Australia
Languages: English

and the following phrase air conditioner melbourne.

When I use Max CPC = $100, the result is: AU$6.08.

But, when I use Max CPC = $10, the result is: AU$3.87.

Why is this difference?


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