>  
> John now says: 
>  
> Ok.  I'll assume a price reduction in the output of  
> the accountant.  Still, does the price reduction  
> itself force you to upgrade?  Was the investment 
> in the PC completely recovered by the time it was 
> replaced?   Was it not a "mistake" not to take 
> into account "moral depreciation" when the PC 
> was introduced into the process of production? 
>  
Maybe not.  If the prices fall low enough you may not be able to
compete with the old PC [because the 286 is so much more productive].
Bygones are bygones, as Jevons said.  To remain in business, you may
have to invest.
> 
-- Michael Perelman Economics Department California State University Chico, CA 95929Tel. 916-898-5321 E-Mail michael@ecst.csuchico.edu