This paper analyses the observed phenomenon of public for private fund
substitution in industrial assistance, by examining the public and pr
ivate sector funding of investment under different assumptions about t
he nature of the private capital marker. This bears an the effectivene
ss of industrial subsidies, and has implications for welfare and the d
esign of optimal assistance contracts. It is shown that fund substitut
ion depends crucially on the elasticity of investment with respect to
the user cost of capital in the without-subsidy position, and on the n
ature of any amount and rate constraints on the assistance contract.