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An example for the keyword "Schweizer" (Swiss):
When I chose German as language and Switzerland as country the traffic estimator tells me there were 150 - 190 clicks per day and a cost of 190 - 300 per day.
With the very same settings but adding all other languages to it the estimate is 2 - 3 clicks per day and a cost of 4 - 6 Franken per day.
Why should a word have less clicks if German and all other languages are selected than if only German was selected as language?