Do the rich have more children?
Does divorce increase in hard times?
What are the effects of college education on the chance of getting married, divorced, cohabiting?
Is assortative pairing (by education, income, etc.) the same for same-sex and opposite sex couples?
Does the presence of low-skill immigrants increase wages for the college educated?
What is the relationship between population density and income?
How does the relationship between socio-economic status and fertility change over the course of the demographic transition?
Are health inequalities larger for some ethnic or racial groups than for others?
Do education and occupation influence the proportion of female children in India?
Which age group was hit hardest by the Great Recession?