Penggunaan bukti ekonomi dalam pembuktian perkara-perkara kartel studi terhadap putusan KPPU Nomor 08/KPP-I/2014, putusan KPPU nomor 02/KPPU-I/2016, dan putusan KPPU nomor 04/KPPU-I/2016 = Use of economic evidence in proof of cartel cases for case study verdict kppu number 08/KPPU-I/2014 verdict KPPU number 02/KPPU/I/2016 and verdict KPPU number 04/KPPU/I/2016