Keyword with cpc = 0

is it better keyword for amazon affiliate and adsence earn which has cpc = 0 ? I want to know about is. please let me know that will be helpfull for me. i am very upsat with this type of keywords. so help me anyway that you have good idea. i thing you will give me the best idea that will assist me for my business with amazon affiliate and adsence earn.

How it can be profitable if CPC value is 0?

There is no any keywords which have 0 cpc. That keywords cpc unknown. You can say these keywords are low cost

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