I. Introduction
The development of the global economy is becoming more and more unbalanced, with the highest ranked countries in terms of nominal GDP including the United States, China, Japan and Germany, and vice versa, including Tuvalu, Nauru and Kiribati. In particular, the GDP of the United States in 2020 will be approximately 21 trillion and the GDP of Tuvalu will be approximately 40 million, a figure that highlights the huge disparity in economic development between the countries involved. High GDP countries typically have diversified economies with multiple strong sectors such as technology, finance, manufacturing and services. In contrast, countries with lower GDPs may be heavily dependent on one or two industries or sectors, making them more vulnerable to economic shocks.