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Scott Cullen wrote: 
 
> ...it is interesting that 60 years ago these IRR  
> models emerged (with precursors elsewhere apparently) to DESCRIBE  
> an economic system. . . . Today, they may well  
> DRIVE most economic activity... 
 
Boulding might have seen here an instance of what he called the  
generalized Heisenberg principle: the attempt to get information out of  
the system changes it.   
 
Yuri Tulupenko 
 
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