Alan F:
> In particular is [the idea of the real wage] useful enough to
> be employed in the following type of
> phrase:
> 
> 'the rate of profit rises if with technological
> improvement if the real wage is constant?'
In this theoretical context constancy of the real wage means
something quite precise: the workers' physical consumption
bundle remains unchanged.  No index number problems.  
Allin Cottrell.