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Tier 1:
At the very top of the world economic pyramid are 75 to 100 million affluent Tier 1 consumers from around the world. This is a cosmopolitan group composed of middle- and upper-income people in developed countries and the few rich elites from the developing world.
Tier 2 and 3:
In the middle of the pyramid, is Tiers 2 and 3, are poor customers in developed nations and rising middle incomes in developing countries, the targets of MNCs' past emerging-market strategies.
Tier 4: Now consider the 4 billion people in Tier 4, at the bottom of the pyramid. Their annual per capita income based on purchasing power parity in U.S. dollars, is less than $1,500, the minimum considered necessary to sustain a decent life. For well over a billion people, the per capita income is less than $1 per day.
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