Conventional theory of converting military to civilian economies holds
that macro-economic policies which stimulate aggregate demand and lab
or policies which enable unemployed defense industry workers to move t
o new employment are sufficient to effect optimal transition from mili
tary to civilian production, without further need to interfere with ma
rket processes. The experience of the USA following World War II is of
ten cited as evidence for this and recommended as a model for a much s
maller 1990s conversion. This article briefly compares the four major
conversions of the 20th century, 1918-21, 1944-47, 1953-55, 1968-74, b
ut focuses on the conversion after World War II. It argues that both v
ery favorable circumstances and considerable advance government and bu
siness planning also contributed to the relative success of the 1940s
US conversion. Nevertheless, that success was sharply limited. For exa
mple, socially weak groups involuntarily left the labor force, and man
y facilities were lost to productive use. These failures resulted from
conflicts over income distribution and a piecemeal planning vision. U
nder the unfavorable macro-economic circumstances of the 1990s and con
trary interests of the military-industrial complex, optimal conversion
requires an alternative policy approach to re-employ up to 2 million
defense workers, and comprehensive decentralized planning for alternat
ive use of production facilities.