Many developing countries go through a phase when fertility/mortality rates start to decline, and for a while they'll get an economic boost while the working-ag

Many developing countries go through a phase when fertility/mortality rates start to decline, and for a while they'll get an economic boost while the working-age population grows at a faster rate than the non-working-age population. That's when East Asian countries laid the foundation for their economic growth. https://en.wikipedia.org/wiki/Demographic_dividend https://en.wikipedia.org/wiki/Demographic_dividend