Stevanus, Rico, and Nursiah Nursiah. 2025. “The Influence of Promotion Mix on the Purchase Decision of Participants of the Grand Reunion Stand of the Medan State Polytechnic Grand Reunion Event ”. Journal of Economics and Social Sciences (JESS) 4 (2):1491-1500. https://doi.org/10.59525/jess.v4i2.1124.