In this paper a mixed oligopoly model is considered, in which a state-
owned public firm competes with both domestic and foreign private firm
s. Previous articles on mixed oligopoly did not include foreign privat
e firms. The effect on the equilibrium involves a lower price and a di
fferent allocation of production (relative to the case when all privat
e firms are domestically owned). In addition, issues such as the effec
ts of an open door policy allowing foreign firms to enter and the effe
cts of foreign acquisition of domestic firms are discussed.