In developing countries, the gradual transition to modern growth seems puzzling given the large productivity growth gap between traditional and modern sectors. We document this transition and develop a theory that resolves this puzzle. The key forces are sector-specific complementarity between...

The process of modernization is neither instantaneous nor homogeneous across countries. Given the large productivity growth gap between traditional and modern sectors, the gradual and varying degree of transition between these technologies seems puzzling. We develop a theory of transition that...