An increasing number of people are moving to major cities, leaving fewer opportunities for economic growth in suburban and rural areas. This phenomenon known as agglomeration shadows has become a focal point of study for economists interested in understanding how and why concentration in urban centers can have negative effects on nearby regions.
A study by Richard Hornbeck, Guy Michaels, and Ferdinand Rauch sheds light on this issue, using historical data from ancient Mediterranean ports. The authors found that large cities not only attract people and resources but can also suppress economic activity in neighboring areas. Like shadows they cast a veil over the growth potential of nearby places.
The authors used ancient ports as an analogy for modern economic centers to understand how agglomeration in one place can impact surrounding areas. Historical data show that ancient ports served as significant trade hubs where resources and goods would gather. However, their importance often hindered the development of other, smaller ports nearby, as traders and craftsmen preferred the stability and advantages of larger centers.
This effect can also be observed today. For example, major metropolises like New York or London not only attract vast amounts of people and capital but also cause business activity to decline in neighboring, smaller cities. By analyzing historical data, the authors concluded that this process is not new—agglomeration shadows have existed since ancient times.
The study also highlighted that agglomeration shadows have a complex impact on local economies.
On one hand, cities benefit from economies of scale due to the dense concentration of people and resources. This leads to increased productivity, improved infrastructure, and innovation. However, this concentrated development often comes at the expense of growth in neighboring areas, which cannot offer the same opportunities and conditions.
Using statistical methods and models, the researchers demonstrated that while urban growth brings overall benefits, the effect of shadows can significantly slow development in nearby regions. In such conditions, local producers and small businesses struggle to compete with large urban enterprises, limiting their economic future.
The study of ancient ports and their impact on the economies of neighboring regions offers interesting parallels with modern metropolises and their surrounding areas.
It underscores the importance of developing balanced regional policies to ensure that agglomeration centers do not negatively impact the growth of nearby territories.
The authors emphasize the need to support suburban and rural areas to mitigate the adverse effects of agglomeration shadows by providing them with competitive advantages and developing infrastructure. Investments in transport hubs, information technology, and educational programs to improve workforce skills can significantly increase the attractiveness of these areas.
The ancient Mediterranean ports show us that the process of agglomeration and its shadows is a long-standing economic phenomenon that has existed for thousands of years. Today, more than ever, it is essential to take these historical lessons into account to avoid one-sided economic development and to create conditions for more balanced growth.
Aytzhan Meirembayev, independent expert
