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This paper aims to evaluate the performance of a chat reference service implemented at an academic library in a private liberal arts college by gauging its impact on other forms of reference service in terms of usage volume, with a focus on research-related face-to-face reference questions.

Two statistical methods are used, namely, the difference-in-differences method and a simple moving average time series analysis, to analyze both the short-term and long-term impact brought by chat reference.

This study finds that the usage volume of the traditional face-to-face reference is significantly affected by chat reference in its first service year. The long-term analysis suggests that chat reference volume displays a significant declining trend (−2.06 per cent academic month) since its implementation. Yet, its usage volume relative to other reference services remains stable over time.

The findings in this case study will be of value to libraries with similar scale and institutional features that are also interested in assessing their chat reference service. In addition, this paper is the first to apply the difference-in-differences approach in the field of library science, and the two statistical methods adopted in this case study can be readily adapted and applied to other similar volume-based library assessment projects.

The article aims to describe the role of training and examines the impact on the wages of university and college graduates.

We use nationwide administrative data on university and college graduates in 2019. The population includes 1.3 million observations, of which 222,000 (∼16%) received training after graduation from an educational institution (from July 2019 to 2022). We used OLS and the “difference-in-differences” methods to estimate the returns to training. Estimates obtained using the DID method turned out to be several times smaller because they consider unobserved characteristics (abilities).

We obtained several key findings. First, the participation of graduates in training is high, despite their recent education. Second, undergoing training is conditional on the existence of wage returns. The results show a wage premium of 17.8% (OLS method) and 2.0% (DID method). Third, graduates from nonselective universities (with low state exam score) try to participate more actively in training to acquire missing knowledge and skills. The wage premium for graduates from nonselective universities is 19.1% (OLS method) and 5.1% (DID method). Fourth, there is a high return to training for graduates from socially relevant fields (education and healthcare), where training is regular and mandatory.

This paper is one of the first to estimate the involvement and returns to training for graduates using nationwide administrative data in Russia.

In 1997 minimum wages were introduced in the West and East German construction sector. The purpose of this paper is to analyze their impact on wage growth and employment retention probability of affected workers.

Following a difference‐in‐differences approach the paper proposes a method to identify the effects of this quasi‐experiment despite the lack of information on working hours in the large panel microdata. The method determines the size of the treatment and control group by the maximum likelihood criterion.

All results show positive wage growth effects of the minimum wage regulation in both parts of the country. When it comes to employment effects, the results clearly differ between the two parts of the country. The employment effects are negative for East Germany and positive for West Germany, although the latter are not always statistically significant.

Although there is a limit to the simple transferability of the results for the construction sector to other industries, the study provides some useful insights for this country concerning reactions to the minimum wage. This is the first paper analyzing the effect of minimum wages in Germany using microeconometric methods.

As the minimum wage in the East German construction sector was much higher in relation to the median wage than in West Germany, a tentative conclusion of the different employment results might be that the trade‐off between increasing wages for low‐paid workers and the danger of job losses does not exist in this case if minimum wages are moderate.

This paper provides valuable information on the impact of wage growth and employment retention probability in Germany.

This chapter examines the effects that airports have had on economic development in cities from 1950 to 2010. It uses a novel dataset consisting of previously unexploited data on the origins and history of the aviation system in the United States. Applying the method of synthetic controls to a set of medium and small airports, I examine both the overall impacts and the heterogeneity within the outcomes of various airports. Then, I use regression analysis to determine key factors differentiating successful airports from less successful ones, as it pertains particularly to population and employment growth. I find that, first, on average, cities have benefited from airports over this period. Airports, overall, provided a causal contribution of 0.2– 0.6% per year on population and employment growth over the time period. Second, I show that city-level factors contributing to airport success include: (1) closer proximity to a major research university, (2) a capital city location, and (3) climate factors, particularly higher January mean temperatures and/or hours of sunshine. City size is a consideration as well; cities in larger metropolitan areas, with larger shares of employment in nontradables in the 1950s, were also better positioned to reap the benefits that airports provided on city growth. Significant differences were not found across regions, airport governance structures, or other factors.

This paper aims to evaluate the impact of the “Postliteracy” program on the qualification of beneficiaries for socioeconomic integration. This qualification is achieved first through the consolidation of the achievements of individuals freed from illiteracy, and then through their support in creating income-generating activities by providing them with technical, economic, legal and institutional knowledge to ensure their conscious and responsible participation in local and regional development efforts.

To evaluate the impact of the “Postliteracy” program, this paper uses quasi-experimental methods with a control group (participants of the “Literacy” program 2020 / 2021) and a treatment group (participants of the “Postliteracy” program 2021 / 2022). Skill acquisition is measured through pretest and posttest evaluations using a questionnaire aligned with the National Agency for the Fight Against Illiteracy (ANLCA)-adopted curriculum. The survey occurred at the beginning and at the end of the program, providing sufficient time for skill development. The questionnaire includes three sections covering socioprofessional characteristics, technical and economic domains and legal and institutional aspects. These sections contribute to a score reflecting the acquired skills for successful socioeconomic integration.

The results of the study demonstrate that the “Postliteracy” program has a positive impact on the acquisition of competences necessary for improved socioeconomic integration of the beneficiaries. The various matching techniques reveal a score difference ranging from 12 to 14 points in favor of program participants compared to those who did not participate. The Difference-in-Differences method confirms the positive and significant impact of the program.

The findings highlight the importance of the “Postliteracy” program in national literacy policy, underlining the need to further strengthen its presence within the programs deployed by ANLCA, notably by increasing the number of beneficiaries targeted by this program. To achieve this, it would be advisable to increase the funds allocated to it within ANLCA's budget.

The originality of this work is a unique research of the case of Morocco based on a microeconometric study for which the authors evaluate the impact of adult education by applying impact evaluation methods in the field of adult literacy.

Given the inevitable transition to renewable resource utilization and the urgent need to reduce carbon emissions, this study conducted quasi natural experiments to assess the impact of renewable resource utilization on carbon emissions based on the national “urban mining” demonstration bases (NUMDB).

This study uses panel data from 275 prefecture-level cities in China from 2006 to 2019. The paper selects NUMDB as the proxy variable and conducts a quasi-natural experiment using a multi-period differences-in-differences model. We examine the impact of NUMDB on reducing carbon emissions, and then deeply explore its mechanism and spatial spillover effect.

This study found that: (1) the construction of NUMDB can significantly decrease the carbon emission in the host cities; (2) NUMDB’s construction has more significantly reduced the carbon emission in regions with higher levels of circular economy development, green technology innovation, regional environmental pollution, digital economy development and financial development; (3) by means of green technology innovation, optimized energy structure, and high-quality talent aggregation, NUMDB reduces urban carbon emissions; (4) NUMDB construction positively affects the carbon reduction efficiency of neighboring regions.

We propose corresponding policy suggestions to further promote the carbon emission reduction effect of NUMDB and develop the renewable resources industry in China based on the research findings.

The contributions of this paper are as follows. Our study contributes to expanding the research scope on the environmental impact of the renewable resource industry, as there are few quantitative studies in this area.

We further consider the spatial heterogeneity of policies and analyze the carbon reduction effect of the NUMDB from the city level, which is beneficial to exploring more targeted and operable carbon reduction paths.

This study on identifying the causal relationship between renewable resource utilization and carbon emission reduction helps to explore the sustainable development path of renewable resource more comprehensively. Meanwhile, this paper provides a reference for other countries to improve the utilization of renewable resource and effectively reduce carbon emissions.

Adolescent pregnancy stands as a societal challenge, compelling young individuals to prematurely discontinue their education. Conversely, an expansion of high school education can potentially diminish rates of adolescent pregnancy, given that educational attainment stands as the foremost risk factor influencing sexual initiation, the use of contraceptive methods during initial sexual encounters and fertility. The aim of this paper is to analyze the impact of the implementation of the public educational policy introducing full-time schools (FTS) for high schools in the state of Ceará, Brazil, on early pregnancy rates.

Using the difference-in-differences method with multiple time periods, we measured the average effect of this staggered treatment on the treated municipalities.

The main result indicates a reduction of 0.849 percentage points in the teenage pregnancy rate. Concerning dynamic effects, the establishment of FTS in treated municipalities results in a 1.183–1.953 percentage point decrease in teenage pregnancy rates, depending on the timing of exposure. We explored heterogeneous effects within socioeconomically vulnerable municipalities, yet discerned no impact on this group. Rigorous tests confirm the robustness of the results.

This paper aims to contribute to: (1) the consolidation of research on the subject, given the absence of such research in Brazil to the best of our knowledge; (2) the advancement and analysis of evidence-based public policy and (3) the utilization of novel longitudinal data and methodology to evaluate adolescent pregnancy rates.

The purpose of this paper is to take occupation opportunity as an indicator to examine the impact of hukou on labor market segmentation in China. It estimates the scale of the impact and identifies the way of the impact. Especially, the paper takes hukou uniform reform as an example and tests whether hukou reforms helped in eliminating labor market segmentation.

The data sets this paper adopted are the 2000 Census and 2005 Mini Census data in China. Linear model and Probit model are used in estimating hukou's impact. Oaxaca/Blinder decomposition is used in decomposing the difference in occupation distribution among hukou statuses. DID evaluation method is used in comparing the region with hukou uniform reform and the region without to capture the influence of the reform.

The result shows that occupation segmentation based on hukou significantly exists in urban labor market. Hukou uniform reform improved the occupation opportunity of local rural workers but migrating rural workers were somehow crowded out. Migrating urban workers did not benefit from the reform. To conclude these, the reform released employment segmentation between rural and urban workers within the reformed region but strengthened the segmentation between the local residents and outcomers which could influence future labor source and scale in reformed area.

The paper evaluates the hukou uniform reform's impact on the labor market using an empirical way for the first time and makes concrete policy recommendations based on these findings.

This study examines the impact of influential shareholders, namely, state and influential businessmen, on the dividend policies of firms. A special focus is made on the causal effect of exogenous changes: general and personal economic sanctions leading to toughened state policies concerning dividends.

Russian firms included into the Moscow Stock Exchange Broad Market Index were examined for a period from 2009 to 2019 using a generalized method of moments and a tobit model. The effect of personal sanctions was elucidated with the use of difference-in-differences method with multiple time periods.

The analysis showed that government or businessmen's ownership does not affect dividend payments. However, after 2014, state-owned companies began to increase their payments. At the same time, owing to a series of changes triggered by general economic sanctions, businessmen-owned companies decrease their dividends payout ratio. Personal sanctions imposed do not have long-term effect on Russian companies' dividends.

This study estimates the effect of ownership structure on dividend payouts after an exogenous change. The results show that there is heterogeneity in influential owners' decisions regarding dividends and changes strengthening it.

Many European countries suspended mandatory conscription after the Cold War, and especially between 2000 and 2010. However, with the changing security situation in Europe, more and more countries are considering the re-introduction of the draft. That is why, it is important to evaluate the impact of conscription on draftees, including its effect on fertility outcomes. Additionally, fertility is of particular interest because birth rates have been below replacement levels in most European countries at least in the last two decades. This, combined with the increase in life expectancy, has contributed to aging population and raises concerns about the future economic prospects and sustainability of the continent. Military service could be related to fertility in several ways. Compulsory service for men would affect the marriage market and subsequently child-bearing outcomes. For example, men who serve in the military would have to delay higher education at least by a year, given that they plan to continue their education after high school. One possibility is that this leads to older men meeting younger women if partners meet at college. Alternatively, in case the partners know each other prior to the draft, service could delay marriage by up to a year due to the conscription, postponing planning and having children, and potentially having fewer children as women might be less able or less willing to have a child after a certain age. Finally, some men who plan and would otherwise continue their education might choose to not do so or to further postpone it once they disattach from studying during their service. For some men, this might influence their marital and subsequent fertility outcomes. In either of these scenarios, a draft or its suspension is likely to be connected to fertility.

This study examines the effect of the suspension of the draft in Spain in December 2001 on three fertility outcomes of men that would have been drafted in the absence of the suspension. The author performs the analysis in a difference-in-differences framework. Potential concerns and policy implications are also discussed.

The findings suggest that after the suspension of the draft, individuals started to have their first child earlier given that they decide to have children. Consistent with the overall time trend, they became less likely to have a child and started to have fewer children. However, the age at birth of the first child decreased while the number of children and the likelihood of having a child increased for men relative to women, after compared to before the suspension of the mandatory draft.

The author extends prior literature by investigating the effect of the abolition of compulsory military service in Spain in December 2001 on fertility. This is novel is several ways. First, to the best of the author’s knowledge, previous literature has examined the effect of this Spanish reform only on labor market outcomes prior to men's conscription. Second, even for other countries that terminated the compulsory draft, fertility has been under-studied, providing an opportunity for further exploration. Third, this analysis is based on rich Census data, representative of the population in Spain. Finally, given the inconclusive findings of previous studies for other countries and the proposed re-introduction of the draft in some parts of Europe, additional evidence of the effect of the conscription has important policy implications necessary for the evaluation of future military service policy decisions.