Why and how did globalization happen? Different perspectives give different explanations for why and how globalization has evolved. Realists argue that international trade is more effective when there is hegemony in the world market, while liberals believe it is a question of how countries use the idea of ​​reciprocity in their decisions about trade. I agree with the realist perspective because hegemony allows the global economy to develop and international trade works best when a hegemon dominates the world market. The realist perspective explains globalization in terms of the relative distribution of power (Nau 2007, 278). In their view, commercial and economic activities thrive “only under favorable security conditions,” and such conditions are based on the relative distribution of power (Nau 2007, 279). They believe that alliances and hegemony are the two most affirmative security conditions. “'Free trade is more likely within than between political-military alliances; and… alliances had a much stronger effect on trade in a bipolar world than in a multipolar world.'” (Nau 2007, 279) In other words, the fewer dominant states with power in the system, the stronger the alliance and its effect on trade. In a multipolar world, countries cannot trust each other in trade because alliances are rarely permanent and therefore countries could use gains from trade to increase their military power and threaten to cause harm to the other country . Therefore, realists argue that,…world economic expansion should be less robust in a multipolar world where countries cannot be sure of stable alliances, more robust in a bipolar world because alliances are more predictable, and more robust in a unipolar world or empire… ... middle of the paper ...... y offer and this causes collapse in the United States and elsewhere (Pinnell, lecture notes, 3 / 23). As a result, countries become very protectionist to protect businesses domestically and international trade collapses (Pinnell, notes, 3/23). Therefore, states must make decisions with reciprocity and consequences in mind (Pinnell, conference notes, 3/23). Again, realists believe that free international trade works best when a hegemon dominates the global market. I agree because hegemony improves the global economy by providing relative distribution of power in different countries. Since each country has its own function in the system, hegemonic power is mandatory to support the world economy and international trade. Works Cited Nau, Henry R. Perspectives on International Relations. 2nd edition. Washington DC: George Washington University, 2007. Print.