I think with OPE:837 Duncan hs placed his finger on the
button.
My view is that the revaluation of old stocks does not
create value but transfers this value from, or to, current
production in the same way and by the same averaging process
that value is transferred between advanced and backward
producers of the same good.
The problem with any other reading is that it allows value
to arise from a source other than human labour, which in
my view is one of the most fundamental things Marx wishes
to deny.
Thus, Marx's account of the formation of social from individual
values is the place to look, if we want to solve this conundrum.
Duncan wrote:
"Why does the revaluation of existing stocks create value in the same
sense that the production of new commodities does?"