Answer:
The existence and growth of government trade barriers
Explanation:
Theodore Levitt proposed that with the advent of technology and the mass media, people's tastes would eventually converge leading to the globalization of markets around the world. Even though people from different nations tend to have different tastes, they were united by factors like love, peace, joy, etc. Levitt was encouraging companies to leverage on the mass media as well as technology to form a convergence of these uniting factors.
However, government trade barriers, which are restrictions placed by the government on the importation of goods into another country can serve as a hindrance to the globalization of markets. This would be in opposition to Levitt's proposal of a uniting factor in international trade. Government trade barriers tend to encourage the production of local goods against the importation of goods.