The workhorse of urban labor theory in development economics is the formal/informal model of labor market segmentation and its variants. The seminal Harris-Todaro model has been extended over the years to cope with various empirical puzzles not explained in the original framework. However, one...

Many of the world's replenishable resources are in decline. Optimal harvests with smooth recruitment is well studied but in recent years, ecologists have concluded that tipping points in recruitment are common. Recruitment with a tipping point has low-fecundity below the tipping point and...