Trade matters except to war neighbors: The international stock market reaction to 2022 Russia’s invasion of Ukraine

We investigate the role of international trade and proximity to war in international stock markets during the invasion of Ukraine by employing DiD designs and panel data comprising 70 stock markets. We find that differences in trade exposure to warring countries (trade effect) have a substantial and negative impact on non-European equity markets but are irrelevant for European markets. In contrast, differences in the distance to warring countries (proximity effect) have a significant and negative impact on European markets but have no bearing on non-European markets. We find that the relevance of rent from mineral, natural gas, and oil resources and the relevance of metals, ores, and fuels in exports operate as mitigators of the trade effect. Our paper provides valuable empirical evidence regarding the importance of mitigating the vulnerability of financial markets to international trade when a major war breaks out.     

After work shopping? Employment effects of a deregulation of shop opening hours in the German retail sector

This study investigates the impact of a deregulation of shop opening laws on employment in the German retail sector. Exploiting the gradual change in the opening times of shops across states and using data from the German Socio-Economic Panel, difference-in-differences estimates indicate an average increase in the employment probability, driven by a rise in the likelihood of working marginal part-time hours. Workers in small firms are likely to experience a reduction of their propensity to work. For individuals facing high family-related, supply-side constraints, the change in shop opening hours has opposing effects on employment — positive on lower and negative on upper parts of the hours distribution. Overall, the deregulation is estimated to have raised the likelihood of working fewer hours than desired by the workers.     

科技金融政策能否降低环境污染？——基于“促进科技与金融结合试点”的准自然实验

在创新驱动城市发展的背景下,科技金融发展为生态环境治理提供了新动力和新方向。本文基于中国2003—2018年262个地级市数据,将“促进科技与金融结合试点”实施视为一次准自然实验,运用双重差分法考察了科技金融政策的环境治理效应及其影响机制。研究发现：首先,科技金融政策的实施对环境污染具有明显的抑制作用,并且与水污染相比,科技金融政策对于空气污染的治理效果更为明显;其次,从城市区位来看,科技金融政策对于东部和北部地区的环境治理效果要优于中部、西部和南部地区;从城市等级来看,科技金融政策对于高等级城市具有更为明显的治污排污效果;最后,中介效应分析表明,金融发展、技术创新和经济规模是科技金融政策改善环境的有效路径。此外,科技金融政策实施对于邻近地区的环境治理具有显著的空间溢出效果。上述分析首次尝试将环境污染纳入到科技金融政策的评估框架中,丰富和完善了环境治理的相关研究,有效地回应了学术界关于科技创新、金融发展和环境治理的争论,为推动经济高质量发展提供了经验证据。     

Gains from horizontal collaboration among ski areas

Ski areas are known to expand by linking their lifts to neighbouring systems. Based on data from approximately 250 winter sport destinations in Austria, pooled over the years 1998–2014, this study explores the effects of such horizontal collaboration on the number of overnights stays in the area. A difference-in-differences (DID) approach combined with propensity score matching shows that new lift-linkages or expansions lead to a consolidation in the number of overnight stays at a level 12 per cent higher than before the introduction of the lift-link. However, there is a certain degree of heterogeneity in the causal effects. Satellite ski areas, remote villages and those who combine lift-linking with new connecting slopes benefit the most. More recent lift-linkages seem to lead to smaller gains than those established in the early years.     

Welfare effects of the euro cash changeover

Using merged data from the British Household Panel Survey (BHPS) and the German Socio-Economic Panel (SOEP), this paper applies a parametric difference-in-differences approach to assess the real effects of the introduction of the euro on subjective well-being. A complementary nonparametric approach is also used to analyze the impact of difficulties with the new currency on well-being. The results indicate a loss in well-being associated with the introduction of the new currency, with the predicted probability that a person is contented with his/her household income diminishing by 9.7 percentage points. We calculate a compensating income variation of approximately one-third. That is, an increase in post-government household income of more than 30% is needed to compensate for the clear decline in well-being. The reasons for the negative impact are threefold. First, perceived inflation overestimates the real increase in prices resulting in suboptimal consumption decisions. Second, money illusion causes a false assessment of the budget constraint. Third, individuals have to bear the costs from the conversion and the adjustment to the new currency. Moreover, it is thought that losses are higher for persons who have difficulties with the new currency. However, the impact of difficulties in using and converting the new currency is rather small, and the initial problems were overcome within one year of the introduction of euro cash.     

Effects of Transparency in Procurement Practices on Government Expenditure: A Case Study of Municipal Public Works

This paper examines the effect of improved transparency in the bidder qualification process, using the experience gained from a case study of municipal public works auctions. A difference-in-differences analysis reveals that improved transparency reduces procurement cost by up to 8%. This finding is robust with regard to the concerns of both endogeneity and sample selectivity. The bidding-function estimates, combined with features of Japanese procurement system, imply that the introduction of transparent practices is insufficient to bring about efficiency in public procurement.      

The pricing of European airbnb listings during the pandemic: A difference-in-differences approach employing COVID-19 response strategies as a continuous treatment

The COVID-19 pandemic has been a major shock to the global tourism industry. Given its peculiarity, this paper analyzes one of the most intriguing questions in the Airbnb literature – the pricing of Airbnb listings – by taking advantage of a difference-in-differences methodology that largely draws on variations in country-level policy responses to the pandemic. Relying on a dataset containing weekly information from 130,999 continuously active listings across 27 European countries from 2019 to 2020, this study first investigates the exogenous impact of response policies (proxied by the COVID-19 Stringency Index) on demand. Secondly, accounting for the endogeneity of both demand and prices, this research analyzes pricing responses to demand variations. Results show that: i) increases in the COVID-19 Stringency Index cause significant declines in Airbnb demand; ii) increases in demand cause, on average, increases in Airbnb prices; and iii) pricing strategies between commercial and private hosts differ substantially.     

担保物权制度改革降低了企业债务融资成本吗?——来自中国《物权法》自然实验的经验证据

本文运用双重差分法考察以《物权法》出台为标志的担保物权制度改革是否降低了企业的债务成本。实证结果显示,《物权法》出台后,与固定资产占比较高的企业相比,固定资产占比较低企业的债务成本显著降低。进一步,与《物权法》出台通过扩大可抵押资产范围、加强债权人保护等渠道降低企业债务成本的经济直觉一致,三重差分检验结果表明,担保物权制度改革对企业债务成本的降低作用表现出丰富差异性:其一,与法律制度环境较好地区相比,《物权法》对企业债务成本的降低作用在法律制度环境较差地区相对更大;其二,与金融市场化程度较高地区相比,《物权法》对企业债务成本的降低作用在金融市场化程度较低地区相对更大;其三,与融资约束较弱企业相比,对于融资约束较强的企业而言,《物权法》对债务成本的降低作用相对更强。这些基于中国经济实践的经验证据识别并揭示出了担保物权制度改革促使企业债务成本下降的作用机理,从而对有效缓解企业融资难、融资贵等问题具有借鉴意义。     

中国低碳城市建设的创新驱动效应评估——兼论多重嵌套试点示范机制的完善

以中国分批次、分地区进行的低碳城市试点作为准自然实验，利用277个城市2003—2017年面板数据和双重差分模型，对低碳城市建设影响低碳技术创新的效应与机理进行系统经验考察。研究发现：①自上而下指定产生、试点单位以省为主的第一批低碳城市试点并未有效促进低碳技术创新，而自下而上申报遴选、试点单位以城市为主的第二批试点则显著推动了低碳技术进步；②政策效应机理是加大政策性研发补贴支持力度，而增加研发从业人员数量和提高经济集聚程度的传导机制并不明显；③环境规制、城市规模和资源禀赋均具有调节作用，对于环保重点城市、“两控区”城市、碳交易试点城市、规模较大城市和资源丰裕程度较低的城市而言，低碳城市建设对低碳技术创新的促增作用更加显著。     

The Impact of Mobile App Adoption on Cross-buying: The Moderating Roles of Product Category Characteristics and Adoption Timing

With more and more companies introducing mobile apps and consumers using them during the purchase journey, it is increasingly important to understand the consequences of app adoption on behavioral outcomes. This paper investigates the impact of app adoption on the number of additional products purchased by customers (i.e., cross-buying) and how this effect varies across different product categories and different customers. We focus on two key product category characteristics (utilitarian vs. hedonic nature and perceived risk) and on adopters who vary in their adoption timings (early vs. late adopters). Using data from an online retailer and a combination of propensity score weighting with difference-in-differences and Heckman correction estimation techniques, the results show that app adoption has a positive effect on cross-buying overall, but the effect varies greatly across products and consumers. App adoption promotes additional product purchases for hedonic products but leads to less cross-buying for utilitarian products. In addition, early adopters purchase a higher number of additional product categories than late adopters, with this difference decreasing over time and for new consumers compared to existing customers. These results offer novel insights into the behavioral consequences of app adoption and provide managers with useful recommendations for improving the effectiveness of their mobile app investments.