Turnover of capital

[Bruce Robinson]

Does anyone know of any statistics that give reliable approximations to the 
rate of turnover of the various forms of capital, both in financial and 
time terms? My assumption is that it has increased pretty rapidly over the 
last 20 years or so, as a result of competition and rapid technological 
change. I know product cycles have shrunk dramatically.

I'd also like to know whether the consequences have been: (a) more rapid 
writing off of obsolescent fixed capital; (b) adjustment through use of 
more flexible (computerised) forms of fixed capital which can be adapted to 
the need to change; (c) a more rapid forcing out of firms that have a 
higher than average organic composition and cannot adjust. I expect it's 
some combination of the three. Can anyone help or point me towards any 
sources of information on this?

Thanks.

Bruce Robinson