From Forbes in 2011:
In society after society, [Bill Gates] saw, when the mortality rate falls—specifically, below 10 deaths per 1,000 people—the birth rate follows, and population growth stabilizes.
Does population growth stabilize when the mortality rate falls below 10 deaths per 1,000 people?
What are societies of the societies mentioned as "society after society?"
I know that "More economically developed countries...have lower fertility rates [BBC]." However, this doesn't specifically relate to a mortality rate below 10 deaths per 1,000 people. Where did the number of "10 deaths per 1,000 people" come from?
Note: @plasticinsect correctly pointed out "10 deaths per 1000 people over what period of time? Per year? Per month? Per day?" Forbes didn't address this, so your answer should.