Mongolia's mass privatization program was implanted in a country that lacke
d the very basic institutions of capitalism. This paper examines the effect
s of competition and ownership On the efficiency of the newly privatized en
terprises, using a representative sample of enterprises and controlling for
possible selection biases. Competition has quantitatively large effects; p
erfectly competitive firms having nearly double the efficiency of monopolie
s. Enterprises with residual state ownership appear to be more efficient th
an other enterprises, reflecting an environment where the government was pr
essured to focus on efficiency and institutions gave little voice to outsid
er owners. (JEL PO, L1, L33, O12).