Clark's sector model (see <a href="https://en.wikipedia.org/wiki/Industry" class="extiw" title="en:Industry">Industry</a>)
User:Nickcampbell18
An own SVG reproduction of <a href="//commons.wikimedia.org/wiki/File:Clark%27s_Sector_Model.png" title="File:Clark's Sector Model.png">File:Clark's Sector Model.png</a>