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drkohler said:
What a complete bullshit graph. I can assure you that at least half of Bangla Desh and India falls into the "poor group", whatever way you want to define "niddle class".
Bad Science operating at its worst.

I won't dispute that they do, but keep in mind that this is a topic about the world, not just two countries. India and Bangladesh combined only make up roughly 1.5 billion of the 7.3 billion that is the world's population. Even if the entirety of those countries fell into the poor group, it would be very possible for half of the Earth's population to be middle class or richer.