The most common form of online marketing is pay-per-click advertising through a service like Google AdWords.  When you use AdWords, you choose the keywords you think your customers are looking for, and you choose how much you’re willing to spend to attract those customers.  AdWords displays your ad when Google users search for your keywords.  The more you’re willing to spend, the more prominently your ad is displayed. 
It also shows that you need substantial traffic to make much money through advertising. At a CPM Of £10 with 2 ad units on the site, you would make just £4,000 per month even with a million page views per month for which you serve paid ads to 20% of the audience. Set this to 100% if you are selling all your ad inventory, as for example through Google Adsense.
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