I need to be referred to literature that indicates how employees are
now considered "human capital" and how that has changed from various
historical perspectives on employees.  Specifically I am looking to
compare historical and contemporary theorists to indicate how the
worker and employee has been transformed into an asset that must be
recruited and retained.  Past theorists should include Adam Smith etc.

We are fast approching a condition in which computer programs and
robotics can perform most of the functions of average employees.
Average employees will be available cheap ssoon.
 What companies need now is employees who can out-perform the computer
and robotics, by makong decisions which are close to optimum most of
the time. When they think they have such an empkoyee, retention is a
top priority as they may have to hire thousands before find another
human that skilful.   Neil