Which factor is least likely to affect international tourism?

The question asks about the factor that is least likely to affect international tourism. There are many factors that can influence international tourism, such as political stability, economic conditions, cultural attractions, natural attractions, infrastructure, and exchange rates. However, one factor that is least likely to affect international tourism is the local population's literacy rate. While literacy rate can indirectly affect the quality of services provided to tourists, it is not a direct factor that tourists usually consider when deciding to visit a country. They are more likely to be influenced by factors such as safety, attractions, cost, and accessibility.