Kind of pricing model do agencies and freelancers use for clients: 55% retainer fee, 21% price per campaign/project, 15% hourly rate, and 9% price per link.
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Publication Title: The State of Link Building Report 2021

Source Link:
https://info.aira.net/hubfs/Aira_State_of_Link_Building_Report_2021.pdf

Publication Year: 2021