In the present article the author discusses the sources of the priviledged position of enterprises on the socialist mairket. Some economic organizations.' are vested with an unparalelled power the market power-which is capable to reverse the legal principle of equality of parties in civil law relations. In the author's opinion the following factors are decisive in respect of a facticiousenterpirise position on the market: the size of an enterprise, the level of market monopolization as well as a market type. The author indicates at the high degree of concentration of production in the Polish economy, at advocatinig the advantage of quantity production and at the fact of far reaching monopolization of the economy. The monopolistic t...