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Creators/Authors contains: "Zhao, Boyuan"

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  1. ABSTRACT Syringe littering in public places is a public health problem in many big cities nationwide amid the ongoing opioid crisis. Besides needle exchanges and/or safe disposal efforts, cash incentives have come into play as a policy tool to address the issue. In December 2020, the City of Boston launched the Community Syringe Redemption Program (CSRP), which offers a nominal cash “buy back” incentive for used syringes at designated centers. This study examines the impact of Boston's CSRP on reducing syringe litter. It employs a distance band‐based, near‐far identification strategy and uses the difference‐in‐differences (DID) to analyze Boston's 311 service requests related to needle pickup and the number of discarded needles discovered in response to the pickup requests before and after CSRP's implementation. Results show that both 311 requests and publicly discarded syringes have reduced significantly in neighborhoods located within a 0.5‐mile radius of the CSRP redemption center. There are no statistically significant reductions observed in 0.5–1‐mile or 1–1.5‐mile donut bands around the center. In effect, although CSRP could be effective in reducing syringe littering, its impact is geographically bounded and sensitive to the redemption centers' locations. Results from alternative models, robustness tests, and placebo tests are consistent with main findings. 
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    Free, publicly-accessible full text available July 30, 2026
  2. Janssen, Marijn; Janowski, Tomasz Tomasz (Ed.)
    This paper examines the relationship between digital transparency and citizens' participation in government activity, specifically, online crowdsourcing. Many local governments have enhanced service transparency by disclosing and sharing information of government activities in digital format. These digital-driven transparency mechanisms often introduce interactive, tailor-made, and user-generating features to online government platforms. This paper explores the efficacy of digital transparency on citizens' participation in online crowdsourcing activities and its heterogeneous influences on various socioeconomic groups. Using the Propensity Score Matching and Difference-in-Differences (PSM-DID) method, this study analyzes the impact of digitized information disclosure to citizens' participation in Sacramento 311, an online crowdsourcing platform. It is found that enhancing digital transparency promotes citizens' participation in online crowdsourcing activities. Furthermore, results suggest that the influence of digital transparency on citizen participation is short termed and varies across communities of different socioeconomic conditions. 
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