Developing countries seeking to follow the successful investment-led growth model blazed by China often run into a problem - high domestic borrowing costs that render infrastructure too expensive to build.
This can push countries to borrow more cheaply from abroad, leaving them potentially vulnerable to a debt crisis if this money is suddenly withdrawn, or, instead, remain mired in poverty.
For many countries, the way out of this dilemma is simply to have fewer babies, at least according to one economist.
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