This paper develops a two-sector R&D-based growth model with congestion effects from increasing urban population density. We show that endogenous technological progress causes structural change if there are positive productivity spillovers from the modern to the traditional sector and Engel's...

This paper explores the relationship between aggregate and relative congestion, returns to scale and economic growth. Aggregate congestion reduces the effective productivity of capital; relative congestion reduces the effective productivity of labour. Both forms of congestion adversely affect...

This article analyzes the effect of migration from a less advanced economy to a more advanced economy on economic growth. The analysis is performed in a two-country growth model with endogenous fertility, in which congestion diseconomies are incorporated. The model shows that out-migration...

We introduce a model of technological advances as allowing for greater productivity at the cost of increased complexity. Complex goods and services require a large number of strongly complementary inputs. Innovation increases the probability that an input will be flawed, leading to a skewed...