This is because such countries have moved furthest along the demographic transition from poor, high-fertility status to richer, low-fertility status.

ECONOMIST: African child mortality

The Shenzhen-based company had 3.1% of the global market in 2011, up from only 1.3% the previous year, as it continued to transition from low-cost phones to high-end smartphones and tablets under its own brand.

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Precise tuning between the speaker drivers ensures a smooth transition between low- to mid- and high-frequencies.

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