There are several dimensions to depreciation. First, depreciation plays 
an important role in tax accounting, perhaps giving new meaning to 
fictitious value. For business accounting, depreciation is a way of 
sorting out the surges in expenditure to be able to get an accurate 
view of profits over time. For example for much of the 19th century, 
accountants did not use depreciation. Railroads, for example, would 
look enormously profitable in years in which no major replacements 
occurred.
Marx used depreciation somewhat in the same way, but depreciation is 
backward looking, based on past experience. In the case of a company 
using lots of traditional lightbulbs, expected number of replacements 
is probably going to be fairly accurate.  In this way, Marxian 
accounting would have the lightbulbs gradually giving up their value.  
Moral depreciation represents the unexpected.  Suddenly LED lighting 
becomes significantly more efficient. The firm discards working 
lightbulbs, which now have no value.
In terms of Simon's suggestion, buildings depreciate according to 
accounting standards. A building that has been completely depreciated 
may be sold to another owner, who will begin the depreciation process 
all over again.



On Sun, Sep 06, 2009 at 01:44:47PM +0100, Simon Ward wrote:
> Without wishing to enter into the detail of this discussion, you might 
> want to consider depreciation (plus annual capital expenditure) as an 
> ongoing cost of maintaining sunk capital. It might get interesting when 
> the accumulated depreciation reaches and passes the value of the sunken 
> capital. If that capital is still generating (in combination with a 
> labour input) value, but is assumed to have passed its lifetime in terms 
> of accumulated depreciation - then what?
>
> Not sure this will help.
>
> Simon Ward
>
>
>
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-- 
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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