“…Existing literature has studied the investment environment (Li et al, 2019a), scientific collaboration network (Gui et al, 2019), trade efficiency (Fan et al, 2016), traffic patterns (Wang et al, 2015), flow distribution (Sheu and Kundu, 2018), agricultural development (Li et al, 2018;Liu et al, 2019), environmental degradation (Hafeez et al, 2018), nomadic ecology (Frachetti et al, 2017;Hermes et al, 2018), and resource cooperation (Dong et al, 2015;Yu et al, 2015) within the framework of BRI. By constructing the integration index, the existing literature analyses the impact of cultural integration, tariff reduction and trade facilitation on inter-regional trade relations (Wang, 2017;Chung, 2018).…”