Final answer:
Global cities are considered high-order central places in Central Place Theory due to their complex and specialized goods and services that are not widely available elsewhere.
Step-by-step explanation:
Global cities are found high in the hierarchy of Central Place Theory. According to this theory, there are different orders of central places that provide various goods and services. These places can range from small towns that offer basic items to large global cities that provide specialized and high-order goods and services. The characteristics of global cities include hosting the headquarters of multinational corporations, having international political influence, and serving as the locations for international NGOs. Global cities, due to their extensive range of services and functions, fall under the category of high-order central places.