In many applications in applied statistics, researchers reduce the complexity of a data set by combining a group of variables into a single measure using a factor analysis or an index number. We argue that such compression loses information if the data actually have high dimensionality. We...

We develop an optimizing life-cycle model of retirement with perfect capital markets. We show that longer healthy life expectancy usually leads to later retirement, but with an elasticity less than unity. We calibrate our model using data from the US and find that, over the last century, the...

We estimate the effect of fertility on female labor force participation in a cross-country panel data set using abortion legislation as an instrument for fertility. We find a large negative effect of the fertility rate on female labor force participation. The direct effect is concentrated among...

This paper discusses the links between income and infectious disease epidemics and asks how such links are affected by changing global circumstances. Having money and living in a prosperous society protects individuals against health setbacks in general and epidemics in particular. Healthy...

Most of the variation in height across countries in Sub-Saharan Africa is due to fixed effects, however, we find that variations in cohort height over time are sensitive to changes in infant mortality rate, GDP per capita, and protein intake, both at birth and in adolescence.

In the past 50 years, the world accelerated its transition out of long-term demographic stability. As infant and child mortality rates fell, populations began to soar. In most countries, this growth led to falling fertility rates. Although fertility has fallen, the population continues to...

In most developing countries, rising levels of nutrition and improvements in public health have led to declines in infant mortality and rising adult heights. In Sub-Saharan Africa we see a different pattern. Sub-Saharan Africa has seen large reductions in infant mortality over the last fifty...