By Tatiana Zárate-Barrera

This paper estimates the non-monotonic effects of air pollution on criminal activity in a developing country setting and provides empirical evidence on the potential behavioral responses mediating this relationship. To do so, I combine daily administrative data on crime, air pollution, and sentiment polarity from millions of social media posts in Mexico City between January 2017 and March 2020. The identification strategy relies on highly dimensional fixed-effect models, non-parametric estimations of dose-response functions, and an instrumental variable approach that employs wind speed and wind direction as instruments for air pollution. My results suggest a causal and inverted U-shape relationship between air pollution and crime. Specifically, there is an inflection point after which marginal increases in air pollution negatively affect criminal activity. Exploring the mechanisms behind this relationship, I find that air pollution has the power to shape people’s emotional states and mobility patterns. These results provide important insights for developing countries where pollution levels are dangerously high, and crime is still one of the most pressing issues. In particular, under certain circumstances, environmental regulation tailored to reduce air pollution must consider the presence of behavioral responses and these non-linear interactions with criminal activity in their design. 

Unpublished paper, 2021. 48p.

By Nick Drydakis

This study investigates the relationship between social vulnerability, illegal activities, and location-based business disruptions in Athens, the capital of Greece. The research utilizes repeated cross-sectional data from 2008, 2014, and 2023, gathered from areas with high levels of criminal activity, reflecting the experiences of business owners and managers in these locations. The findings reveal that heightened levels of social vulnerability—including the presence of illicit drug users and homeless individuals—alongside illegal activities such as gang-related protection rackets and black-market operations, are associated with increased location-based business disruptions. These disruptions manifest in assaults on employees and customers, business burglaries, reputational damage, supply chain problems, and decreased turnover. The study also examines the impact of economic conditions in 2014 and 2023, when Greece's Gross Domestic Product was lower than in 2008, indicating an economic recession. The findings suggest that the economic downturn during these years further exacerbated location-based business disruptions. Conversely, enhanced public safety measures, such as increased police presence, law enforcement, and improved public infrastructure, were associated with a reduction in these disruptions. Furthermore, an interesting insight was that businesses with longer operating histories tend to experience fewer location-based disruptions, indicating that operating history might be perceived as a resilience factor. The study suggests that policy actions should focus on increasing police visibility, providing financial support to high-risk businesses, funding urban regeneration projects, maintaining public infrastructure, and delivering social services aimed at helping marginalized communities escape vulnerability.

 Bonn:  IZA – Institute of Labor Economic, 2024. 46p.