identification strategy
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2022 ◽  
Vol 46 ◽  
pp. 103848
Author(s):  
Essam H. Houssein ◽  
Fatma A. Hashim ◽  
Seydali Ferahtia ◽  
Hegazy Rezk

2021 ◽  
Author(s):  
Eric A Hanushek ◽  
Lavinia Kinne ◽  
Philipp Lergetporer ◽  
Ludger Woessmann

Abstract Patience and risk-taking – two preference components that steer intertemporal decision-making – are fundamental to human capital investment decisions. To understand how they contribute to international skill differences, we combine PISA tests with the Global Preference Survey. We find that opposing effects of patience (positive) and risk-taking (negative) together account for two-thirds of the cross-country variation in student skills. In an identification strategy addressing unobserved residence-country features, we find similar results when assigning migrant students their country-of-origin preferences in models with residence-country fixed effects. Associations of national preferences with family and school inputs suggest that both may act as channels.


2021 ◽  
pp. 1-40 ◽  
Author(s):  
Shelley X. Liu

Abstract This article examines how rebels govern after winning a civil war. During war, both sides—rebels and their rivals—form ties with civilians to facilitate governance and to establish control. To consolidate power after war, the new rebel government engages in control through its ties in its wartime strongholds, through coercion in rival strongholds where rivals retain ties, and through cooptation by deploying loyal bureaucrats to oversee development in unsecured terrain where its ties are weak. These strategies help to explain subnational differences in postwar development. The author analyzes Zimbabwe's Liberation War (1972–1979) and its postwar politics (1980–1987) using a difference-in-differences identification strategy that leverages large-scale education reforms. Quantitative results show that development increased most quickly in unsecured terrain and least quickly in rival strongholds. Qualitative evidence from archival and interview data confirms the theorized logic. The findings deepen understanding of transitions from conflict to peace and offer important insights about how wartime experiences affect postwar politics.


2021 ◽  
Vol 12 ◽  
Author(s):  
Savannah D. Neu ◽  
Bonnie N. Dittel

Regulatory B cell or “Breg” is a broad term that represents the anti-inflammatory activity of B cells, but does not describe their individual phenotypes, specific mechanisms of regulation or relevant disease contexts. Thus, given the variety of B cell regulatory mechanisms reported in human disease and their animal models, a more thorough and comprehensive identification strategy is needed for tracking and comparing B cell subsets between research groups and in clinical settings. This review summarizes the discovery process and mechanism of action for well-defined regulatory B cell subsets with an emphasis on the mouse model of multiple sclerosis experimental autoimmune encephalomyelitis. We discuss the importance of conducting thorough B cell phenotyping along with mechanistic studies prior to defining a particular subset of B cells as Breg. Since virtually all B cell subsets can exert regulatory activity, it is timely for their definitive identification across studies.


2021 ◽  
Vol 11 (1) ◽  
pp. 75-78
Author(s):  
Lee-Ryeok Han ◽  

2021 ◽  
pp. 002224372110621
Author(s):  
Shunyuan Zhang ◽  
Dokyun Lee ◽  
Param Singh ◽  
Tridas Mukhopadhyay

We examine whether and how ride-sharing services influence the demand for home-sharing services. Our identification strategy hinges on a natural experiment in which Uber/Lyft exited Austin, Texas, in May 2016 due to local regulation. Using a 12-month longitudinal dataset of 11,536 Airbnb properties, we find that Uber/Lyft’s exit led to a 14% decrease in Airbnb occupancy in Austin. In response, hosts decreased the nightly rate by $9.3 and the supply by 4.5%. We argue that when Uber/Lyft exited Austin, the transportation costs for most Airbnb guests increased significantly because most Airbnb properties (unlike hotels) have poor access to public transportation. We report three key findings: First, demand became less geographically dispersed, falling (increasing) for Airbnb properties with poor (excellent) access to public transportation. Second, demand decreased significantly for low-end properties, whose guests may be more price-sensitive, but not for high-end properties. Third, the occupancy of Austin hotels increased after Uber/Lyft’s exit; the increase occurred primarily among low-end hotels, which can substitute for low-end Airbnb properties. The results indicate that access to affordable, convenient transportation is critical for the success of home-sharing services in residential areas. Regulations that negatively affect ride-sharing services may also negatively affect the demand for home-sharing services.


PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0258195
Author(s):  
Marina Tkalec ◽  
Ivan Žilić

Although conflict, war, violence, and terrorism affect tourism, research that identifies possible channels of these effects is scarce. We explore if the adverse effects are channelled through proximity to conflict areas. We use the conflict in Kosovo in 1999 and the country Croatia as a quasi-natural experiment and take advantage of the specific north-west to south-east orientation of Croatian Adriatic counties to identify the effect of NATO bombing in Kosovo on tourism outcomes as well as the potential proximity channel. Using data on the population of Croatian firms and the difference-in-differences identification strategy we find that tourism companies’ revenues decreased significantly due to NATO bombing, especially in accommodation services and in companies with 50 or more employees. However, using a synthetic control approach we find that the adverse effect is only transitory. Analysing heterogeneous effects with respect to the distance of the firm from Kosovo—using a linear and a more flexible model—we find compelling evidence that within-country proximity to conflict is not a significant channel through which the negative effect propagates.


2021 ◽  
pp. 1-22
Author(s):  
German Caruso ◽  
Lautaro Chittaro ◽  
Maria Emilia Cucagna ◽  
Luis Pedro Espana

Policy responses to COVID-19 affected the dynamic of eco¬nomic growth and labor markets worldwide, hitting econom¬ically harder on developing countries. These policies involved economic lockdowns that included the shutdown of the main statistical exercises, making it almost impossible to assess the breadth and variety of their effects. Using a phone survey, this paper examines the impact of the quarantine implemented in Venezuela on labor market outcomes. The identification strategy exploits the exogenous variation in the severity of the lockdown in different regions of the country. The main result indicates a 16.5 percentage points reduction in employment, while in regions with severe lockdowns the reduction has been 13.8 p.p. larger. In particular, the self-employed and informal¬ly employed were hard hit by the lockdown. To cope with this effect, households sold their productive assets, reduced their savings, sought for alternative income sources and looked for help from relatives. This paper does not find a differential ef¬fect on the number of COVID-19 cases in more severe lock¬down settings. Results are robust to endogenous migration and alternative specifications.


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