This figure shows a sign graph of the logical pitfalls of this diagramming technique. On the left-hand side of the figure, the population component is linked to the births component with a positive signed arrow, and the births component is linked to the population component with a negative signed arrow. On the right-hand side of the figure, the population component is linked to the deaths component with a positive signed arrow, and the deaths component is linked to the population component with a negative signed arrow

 2.6 Representing feedback through sign graph diagrams