World System Theory
The most widely followed adaptation of world system theory was developed by Immanuel Wallerstein in 1974 to describe the designation of world areas as developed or underdeveloped areas (Bergesen, 1990). Those areas became known as core zones, semiperipheral, and peripheral zones (McPhail, 2014). Within the system order exist an equal process of trade and exchange, where core zones hold the power (Bergesen, 1990). The zones consistently interact on various levels, including economically, politically, culturally, and socially (McPhail, 2014).
Agenda Setting Theory
Agenda setting theory is made up of several factors; however, it is often described as the transfer of issue importance from the news to the public (Kim & McCombs, 2007; McCombs, Shaw, & Weaver, 2014). Agenda setting has been used to approach different forms of communication, including advertising and social media. The theory has also been expanded to explore specific cultural topics and news events (Bantimaroudis, Zyglidopoulos, & Symeou, 2010; McCombs et. al, 2014).