Venerated in art and poetry, Korea’s verdant mountain forests hold a special place in Korean people’s hearts. Like their political systems and economies, however, forest fortunes in North and South Korea have gone in very different directions since the country’s division more than 70 years ago.

Most citizens of democratic nations expect their governments to do their very best to make society more egalitarian, productive, adaptive, and resilient. To do so requires governments to track not just today’s headlines but grapple with long-term underlying trends, like globalization and demographic change. Governments must also make assumptions about the future course of these trends and examine how they might collide or build on one another.

By comparing “first wave” developing countries, like Sweden and the United States, to “second wave” developers, like South Korea and Japan, Thomas Anderson and Hans-Peter Kohler of the University of Pennsylvania seek to explain why countries that underwent socioeconomic development in the first half of the 20th century have slightly higher fertility levels than those that developed later. Despite “both sets of countries attaining high income and generally low fertility, contemporary gender norms and levels of gender equity differ between them,” write Anderson and Kohler in a new study in Population and Development Review.