This is an implementation of Lomi and Larsen's 1996 model of 
the dynamics of organizational populations. Their paper appeared
in the  Academny of Management Journal in 1996 Vol 39 No 4,
pages 1287-1321.

I have shamelessly used the Mousetrap model as a starting point
and have swapped balls for companies. These companies live on a
2d Ca and evolve according to simple rules. They enter (are born)
if there is a sufficent number of other companies in their local
neighbourhood. They exit (die) if there becomes too few companies
in their neighbourhood to trade with, or if there are too many 
companies in which case they are crowded out.

In the model the parameter K defines a companies neighbourhood.
Elower and Ehigher define the range in which the companies survive
and Birth defines the condition for a company to enter.
These rules can be found in the stepRule method in LLAMJ_Ca2d.m
For more details see the paper.

Christopher Day (cday@lbs.ac.uk)
Doctoral Candidate
Decision Science Dept.
London Business School
U.K.
