Example application of <a href="https://en.wikipedia.org/wiki/matrix_multiplication" class="extiw" title="en:matrix multiplication">matrix multiplication</a> in economics, from <cite class="book" style="font-style:normal">Peter Stingl (1996)    (in german)  <i> Mathematik für Fachhochschulen – Technik und Informatik</i> (5th ed.), <a href="https://en.wikipedia.org/wiki/en:Munich" class="extiw" title="w:en:Munich"><span title="capital and most populous city of Bavaria, Germany">Munich</span></a>:  Carl Hanser Verlag  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/3-446-18668-9" title="Special:BookSources/3-446-18668-9">3-446-18668-9</a>. </small></cite> Exm.5.4.10, p.205-206. 
<p>The highlighted paths in production flow (upper part) correspond to the highlighted computation of the lower left field in the product matrix (lower part). 
</p>
See <a href="https://en.wikipedia.org/wiki/Matrix_multiplication#Resource_allocation_in_economics" class="extiw" title="en:Matrix multiplication">en:Matrix_multiplication#Resource_allocation_in_economics</a> for full description of the scenario.
<a href="//commons.wikimedia.org/wiki/User:Jochen_Burghardt" title="User:Jochen Burghardt">Jochen Burghardt</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>