Production often causes pollution as a by-product. Once pollution problems become too severe, regulation is introduced by political authorities which forces the economy to make a transition to cleaner production processes. We model this transition as a change in "general purpose technology"...

Developing Asia has undergone a dramatic shift over the past 5 decades from a region of mainly low-income economies toward one that is largely middle income. Compared with world aggregate data, developing Asia now has a much greater proportion of middle-income economies. The region faces the...