α (Y-P)=α (P - P)= Pα (I -I)=?P
q q
Thus I (II) =n?P+?P
II
The ? ?P: Shift in profits
the above reminds of Salter, Productivity + technical change.
B-factor: ? is identified with
a depreciative role
based on obsolescence ("obsolescence rate")
So far we have considered that the businessman
compares relates the increase in profits to the current investment
and compares this with a standard ?.