A reply to Jerry's ope-l 3170.
I liked Jerry's points. Agreed with almost everything. One hour of *socially
necessary* labor always adds the same value in Marx's theory. When average
intensity rises (falls) over time, one clock hour of labor of given intensity
creates less (more) than one hour's worth of value. Average intensity can
change even during a production period. In examples that assume a period of
production that begins and ends at the same time throughout the economy, this
phenomenon can't arise.
Andrew Kliman