This week reading mainly show a rule about 80/20 to viewers.  Pareto found this rule from the production of his pea pods, then he using this rule to relate lots of interesting things in sociological area. Such as the 80% of profits are produced by only 20% of the employees and so on. Also, the author show an example of highway maps, which help the viewer have a deep understanding of this idea.

Reference

Barabási, Albert-László 2002,“The 80/30 Rule”. Linked: The New Science of Networks. Cambridge (MA): Perseus, Print..