Oláh , J. , Popp , J. , Máté, D. and Ardhi Hidayat , Y. 2019. Market structure and concentration ratio: evidence of IT companies in Hungary. Forum Scientiae Oeconomia. 7, 3 (Sep. 2019), 7–18. DOI:https://doi.org/10.23762/FSO_VOL7_NO3_1.