These are Nation Categories based on financial data from three trusted international sources. This data is averaged and carefully reviewed to group countries into A, B, and C categories. Category A represents the highest costs, B is mid-range, and C is the lowest. In this example: A = 3,000, B = 2,200, and C = 1,800. The categories are reviewed regularly, so a country’s category may change if its financial situation changes.
See the full list at Nation Categories