Vivi Silvia Syiah Kuala University   Kopelma Darussalam, Syiah Kuala Banda Aceh, Aceh 23111 Indonesia   vivisilvia@unsyiah.ac.id   http://s3ie.unsyiah.ac.id/profil-prodi-die-feb-unsyiah           JEL Areas: F0 : International Economics: General D4 : Market Structure and Pricing: General