Tiered link building helps you squeeze more value out of your outreach efforts....

https://www.scribd.com/document/1032066985/Why-Are-My-Rankings-Not-Moving-After-Building-Backlinks-A-Troubleshooting-Guide-163537

Tiered link building helps you squeeze more value out of your outreach efforts. By strategically pointing Tier 2 links toward your Tier 1 assets, you can amplify the authority flowing to your site