Why do users choose Open Source software? Analysis of the network effect

This article analyses the phenomenon of using the Open Source software. Its aim is to verify the existence of a positive direct network effect that characterizes using of the Open Source software. The multivariate probit model is used to extract factors motivating users to the usage of the Open Source software. Special attention is paid to demographic characteristics of users, as well as to the impact of users' acquaintances, such as family, work and school on using the Open Source software. The results of the conducted analysis confirm our research.