  This paper is a study of the history of the transplant of mathematical tools
using negative feedback for macroeconomic stabilization policy from 1948 to
1975 and the subsequent break of the use of control for stabilization policy
which occurred from 1975 to 1993. New-classical macroeconomists selected a
subset of the tools of control that favored their support of rules against
discretionary stabilization policy. The Lucas critique and Kydland and
Prescott's time-inconsistency were over-statements that led to the "dark ages"
of the prevalence of the stabilization-policy-ineffectiveness idea. These
over-statements were later revised following the success of the Taylor rule.
