New Papers: effects of oil discoveries, the source of productivity in African economies, and other topics.

The recent increase in productivity in Africa comes from the informal sector - evidence from Uganda. 

"[Oil] discoveries increase per capita oil production and oil exports by up to 50 percent. But these giant oilfield discoveries also have a dark side: they increase the incidence of internal armed conflict by about 5-8 percentage points."

The cultural basis of economic growth in Vietnam.

Do mother's earn less money than non-mothers? The evidence from Colombia says that they do, but the difference is not that large (1.73%).