“…A theoretical model justifying the use of a gravity equation for modeling tourism demand was formulated by Morley, Rosselló, and Santana-Gallego (2014). In addition, many studies in the literature on international tourism use gravity equations to investigate the main determinants of tourism demand and/or supply (see, e.g., Khalid, Okafor, and Shafiullah 2020; Santana-Gallego, Ledesma-Rodríguez, and Pérez-Rodríguez 2016; Okafor, Adeola, and Folarin 2021; Khalid, Okafor, and Sanusi 2021). Following previous studies, we use a reduced-form gravity equation to examine the moderating effects of linguistic networks and common languages in the underlying link between migration rates and international tourism flow as specified below:…”