Difference-in-Differences for Policy Evaluation

Using a two‐way fixed effects difference‐in‐differences model, we investigate the effects of local recreational marijuana (RMJ) policy changes on college applications and find that the three largest state public schools reaped, on average, an almost 54% increase in applications. This increase does not appear to come solely from low‐ability students as both first and third quartiles of admitted student composite SAT scores to the largest three public schools do not decrease. Rather, they both increase by almost 3.8% though these estimates are not statistically significant. Robust difference‐in‐difference and event study models support the signs and magnitudes of these gains and show they diminish over time.

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A socioeconomic impact assessment of three Italian national parks

D’Alberto

Pagliacci

Zavalloni

2022

Journal of Regional Science

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The expansion of protected areas (PAs) is feared to negatively affect the local economy, as every PA, albeit to different degrees, entails restriction to the economic activities. The literature on the topic has started assessing what is the socioeconomic impact of PAs, mostly focusing on the Global South. The objective of this article is the analysis of the socioeconomic impact of three Italian national parks (NPs), established in the 2000s, using a counterfactual approach based on both the outcome regression diff-in-diff and the doubly robust diff-in-diff combined with different propensity score-based and Mahalanobis distance matching procedures. We find that the three Italian NPs have a robust and statistically significant impact on average income of residents in municipalities hosting them. Conversely, there is weak evidence that population and local establishments are positively affected, and touristic local establishments and employment are negatively affected by the three NPs. All together the results indicate that the three NPs have no negative effect on the socioeconomic dynamics of the territories impacted, although additional investigations are required to shed lights to the impact mechanisms.

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Difference-in-Differences for Policy Evaluation

Cited by 4 publications

References 53 publications

Causal Evaluation of Educational Policies

Causal Evaluation of Educational Policies

Higher education: The impact of recreational marijuana on college applications

A socioeconomic impact assessment of three Italian national parks

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