Time travel of course. 

>This is very advanced.  Written in 1978, the author has the foresight to 
>quote his 1987 work.  No wonder he won the prize.
>
>Way to go, Paul.
>
>-- 
>Michael Perelman
>Economics Department
>California State University
>Chico, CA 95929
>
>Tel. 530-898-5321
>E-Mail michael at ecst.csuchico.edu
>michaelperelman.wordpress.com
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>


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