This is the first modification proposed by Jay Forrester in his WORLD2 model. The utilization of natural resources is reduced in 1970 to 25% of their former value in order to extend their availability.


  1. Cellier, F.E. (1991), Continuous System Modeling, Springer-Verlag, New York, ISBN: 0-387-97502-0, 755p.
  2. Forrester, J.W. (1971), World Dynamics, Pegasus Communications, 160p.

Simulate the model across 200 years, and plot the state variables as well as the quality of life as functions of the calendar years:

I had to artificially extend some of the tabular functions, because our software complains when an interpolation function attempts an extrapolation.

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