Of these ad revenues, 70% comprise of 20 keyword categories. Companies have to bid for these categories for their ads to appear when a user searches for a related term on Google.
The top category is “insurance”, which accounts for 24% of Google’s ad revenue; each time an insurance ad gets clicked on, the particular advertiser pays about US$55.
Next in line is “Loans” at 12.8% and US$44.28; with “Mortgage” coming in third place at 9% and US$47.23.
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[via The Atlantic]
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