Okay, I'll be more specific. You said:
The problem is that the sector's outputs are always someone else's inputs, so what's bad news for manufacturing producers is good news for those industries that use manufactures as inputs, and/or for real wages.
What I'm saying is: that baseline products which are produced (i.e. basic inputs) probably don't play into the cycle of competition. In fact their cost/value doesn't really mean much because they're submitted to the demand of those companies that buy them.
Okay, we're in a hall of mirrors here... and I think that economists should recognise this problem... its not really about supply and demand (hello Marx...)... its about how the "dialectic" between supply and demand play into profit rate.
I mean really... I'm shocked that Leftists don't see the gap here...