Like any other sandwich, even the "Global Citizen Sandwich" has three separate parts, representing three segments of this specific lifestyle.
At the top of the sandwich, there is a place where you keep your wealth - financial hubs like Singapore, Switzerland, Hong Kong, etc.
In the middle is a place where you live and where you enjoy full freedom and happiness.
Finally, there is a place at the bottom of the sandwich where you grow your money, where you invest. Those are mainly upcoming countries with underrated prices.
The most interesting part is - they are all mutually exclusive, so you can make a unique combination for your own "Global Citizen Sandwich".