Final answer:
The first tier cities are New York, Tokyo, and London. The second tier cities are Mumbai, Chicago, and Paris. The third tier cities are Sydney, Toronto, and Moscow.
Step-by-step explanation:
The cities in the first tier are New York, Tokyo, and London. These cities are considered mega-cities and offer a wide range of high-order goods and services. In the second tier, the cities are Mumbai, Chicago, and Paris. These cities are regional service centers and offer a variety of goods and services. In the third tier, the cities are Sydney, Toronto, and Moscow. These cities have a smaller population and offer a more limited range of goods and services.