Pub Date : 2024-07-16DOI: 10.1016/j.labeco.2024.102605
Xinyan Liu , Yunjiao Xu , Jian Zou
We study the impact of relaxing internal migration barriers on entrepreneurship by exploiting China’s 2014 nationwide hukou reform and the administrative firm registry. Our difference-in-differences estimation finds that reformed counties experience sizable increases in entrepreneurial activities compared to control counties. The reform induces the creation of firms with a smaller scale and a lower likelihood of survival, indicating moderate expansions in labor demand. Migrant workers’ wages decline and entrepreneurial activities improve most in labor-intensive industries, implying that increased labor supply serves as one underlying mechanism. Our findings highlight the important role that removing domestic labor market frictions plays in promoting entrepreneurship.
{"title":"Migration barrier relaxation and entrepreneurship: Evidence from the hukou reform in China","authors":"Xinyan Liu , Yunjiao Xu , Jian Zou","doi":"10.1016/j.labeco.2024.102605","DOIUrl":"10.1016/j.labeco.2024.102605","url":null,"abstract":"<div><p>We study the impact of relaxing internal migration barriers on entrepreneurship by exploiting China’s 2014 nationwide <em>hukou</em> reform and the administrative firm registry. Our difference-in-differences estimation finds that reformed counties experience sizable increases in entrepreneurial activities compared to control counties. The reform induces the creation of firms with a smaller scale and a lower likelihood of survival, indicating moderate expansions in labor demand. Migrant workers’ wages decline and entrepreneurial activities improve most in labor-intensive industries, implying that increased labor supply serves as one underlying mechanism. Our findings highlight the important role that removing domestic labor market frictions plays in promoting entrepreneurship.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102605"},"PeriodicalIF":2.2,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141706097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-14DOI: 10.1016/j.labeco.2024.102596
Gabriela Galassi , David Koll , Lukas Mayr
Linking data from the National Longitudinal Survey of Youth 1979 (NLSY79) and the NLSY79 Children and Young Adults, we document a substantial positive correlation of employment status between mothers and their offspring in the United States. After controlling for ability, education, fertility and wealth, offspring of permanently employed mothers have an 11 percentage-point higher probability to be employed in each given year than those of never employed mothers. The intergenerational transmission of maternal employment is stronger to daughters but significant also to sons. Investigating potential mechanisms, we provide suggestive evidence for a role model channel, through which labor force participation may be transmitted. Offspring seem to emulate the example of their mother when they observe her working. By contrast, we are able to rule out alternative candidate explanations such as network effects, occupation-specific human capital and local conditions of the labor market.
我们将 1979 年全国青年纵向调查(NLSY79)和 NLSY79 儿童与青少年调查(NLSY79 Children and Young Adults)的数据联系起来,发现在美国,母亲及其后代之间的就业状况存在很大的正相关性。在控制了能力、教育、生育率和财富之后,长期就业母亲的后代每年就业的概率比从未就业母亲的后代高出 11 个百分点。母亲就业的代际传递对女儿的影响更大,但对儿子的影响也很大。在对潜在机制的研究中,我们提供了榜样渠道的提示性证据,劳动力参与可能就是通过这一渠道传递的。当后代观察到母亲工作时,他们似乎会模仿母亲的榜样。相比之下,我们能够排除其他候选解释,如网络效应、特定职业的人力资本和劳动力市场的当地条件。
{"title":"The intergenerational correlation of employment: Mothers as role models?","authors":"Gabriela Galassi , David Koll , Lukas Mayr","doi":"10.1016/j.labeco.2024.102596","DOIUrl":"10.1016/j.labeco.2024.102596","url":null,"abstract":"<div><p>Linking data from the National Longitudinal Survey of Youth 1979 (NLSY79) and the NLSY79 Children and Young Adults, we document a substantial positive correlation of employment status between mothers and their offspring in the United States. After controlling for ability, education, fertility and wealth, offspring of permanently employed mothers have an 11 percentage-point higher probability to be employed in each given year than those of never employed mothers. The intergenerational transmission of maternal employment is stronger to daughters but significant also to sons. Investigating potential mechanisms, we provide suggestive evidence for a role model channel, through which labor force participation may be transmitted. Offspring seem to emulate the example of their mother when they observe her working. By contrast, we are able to rule out alternative candidate explanations such as network effects, occupation-specific human capital and local conditions of the labor market.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102596"},"PeriodicalIF":2.2,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141696598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-11DOI: 10.1016/j.labeco.2024.102602
J. Chen , L.I. Dobrescu , G. Foster , A. Motta
In a randomized controlled trial involving hundreds of university students, we provide relative performance feedback specifically designed to reduce low performers’ demoralization, by dynamically assigning students to small leaderboard groups that share a similar score in a semester-long online assignment. Treated students appear 2.6% more likely to go beyond the call-of-duty on their assignment by mid-semester. For low performers, this translates in 0.27 SDs higher exam grades, more stress, increased effort and lower procrastination. High performers are happier, procrastinate less and overachieve in the assignment on which they are ranked, but ultimately also score 0.25 SDs lower exam grades.
{"title":"Can leagues mitigate the demoralization effect of rank feedback? A randomized controlled trial","authors":"J. Chen , L.I. Dobrescu , G. Foster , A. Motta","doi":"10.1016/j.labeco.2024.102602","DOIUrl":"10.1016/j.labeco.2024.102602","url":null,"abstract":"<div><p>In a randomized controlled trial involving hundreds of university students, we provide relative performance feedback specifically designed to reduce low performers’ demoralization, by dynamically assigning students to small leaderboard groups that share a similar score in a semester-long online assignment. Treated students appear 2.6% more likely to go beyond the call-of-duty on their assignment by mid-semester. For low performers, this translates in 0.27 SDs higher exam grades, more stress, increased effort and lower procrastination. High performers are happier, procrastinate less and overachieve in the assignment on which they are ranked, but ultimately also score 0.25 SDs lower exam grades.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102602"},"PeriodicalIF":2.2,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0927537124000976/pdfft?md5=3a31faea32552f6a06ac02502080299a&pid=1-s2.0-S0927537124000976-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141716742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-06DOI: 10.1016/j.labeco.2024.102598
Dante Contreras , Jorge Rodríguez , Sergio Urzúa
Using comprehensive longitudinal data from Chile, we examine the impact of attending a private high school on labor market outcomes. The empirical strategy exploits conditional independence assumptions and leverages the effects of self-selection based on ability. We establish that private high schools boost average adult earnings by 99–144 dollars a month (relative to public schools), equivalent to a 15%–22% premium. We then explore potential channels behind these effects. Both academic and non-academic factors emerge as mediators. Our findings highlight the importance of financial resources, as education investments have long-term impacts on private high school students, while yielding negligible effects for those attending public and voucher schools. Finally, we document the prominent role of firms as mediators of the private school advantages during the school-to-work transition. Our analysis provides new insights into the association between school choice and income disparities, even after controlling for pre-labor market academic performance.
{"title":"Is private education worth it? Evidence from school-to-work transitions in Chile","authors":"Dante Contreras , Jorge Rodríguez , Sergio Urzúa","doi":"10.1016/j.labeco.2024.102598","DOIUrl":"10.1016/j.labeco.2024.102598","url":null,"abstract":"<div><p>Using comprehensive longitudinal data from Chile, we examine the impact of attending a private high school on labor market outcomes. The empirical strategy exploits conditional independence assumptions and leverages the effects of self-selection based on ability. We establish that private high schools boost average adult earnings by 99–144 dollars a month (relative to public schools), equivalent to a 15%–22% premium. We then explore potential channels behind these effects. Both academic and non-academic factors emerge as mediators. Our findings highlight the importance of financial resources, as education investments have long-term impacts on private high school students, while yielding negligible effects for those attending public and voucher schools. Finally, we document the prominent role of firms as mediators of the private school advantages during the school-to-work transition. Our analysis provides new insights into the association between school choice and income disparities, even after controlling for pre-labor market academic performance.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102598"},"PeriodicalIF":2.2,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141690066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-29DOI: 10.1016/j.labeco.2024.102594
Andrei Gorshkov
Using Danish linked employer–employee data, this study examines the importance of access to higher-paying firms in the wage assimilation process among immigrants during their 25-year tenure in Denmark. Upon their arrival, immigrant workers in Denmark earn substantially lower wages than their native counterparts. However, this wage gap diminishes rapidly within the first 5–10 years, particularly among more disadvantaged immigrant groups (non-OECD and female immigrants). Immigrants who enter the labour market early have higher earnings capacity than those who enter later, but this trend reverses after 15 years. The transition to higher-paying firms constitutes a crucial factor in wage assimilation during the initial 5 years, yet it does not account for wage growth beyond this period. Additionally, this study offers suggestive evidence that Danish firms’ wage policies vary based on the duration since migration, and these differences significantly contribute to the wage assimilation process.
{"title":"Job ladders and labour market assimilation of immigrants","authors":"Andrei Gorshkov","doi":"10.1016/j.labeco.2024.102594","DOIUrl":"https://doi.org/10.1016/j.labeco.2024.102594","url":null,"abstract":"<div><p>Using Danish linked employer–employee data, this study examines the importance of access to higher-paying firms in the wage assimilation process among immigrants during their 25-year tenure in Denmark. Upon their arrival, immigrant workers in Denmark earn substantially lower wages than their native counterparts. However, this wage gap diminishes rapidly within the first 5–10 years, particularly among more disadvantaged immigrant groups (non-OECD and female immigrants). Immigrants who enter the labour market early have higher earnings capacity than those who enter later, but this trend reverses after 15 years. The transition to higher-paying firms constitutes a crucial factor in wage assimilation during the initial 5 years, yet it does not account for wage growth beyond this period. Additionally, this study offers suggestive evidence that Danish firms’ wage policies vary based on the duration since migration, and these differences significantly contribute to the wage assimilation process.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102594"},"PeriodicalIF":2.2,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0927537124000897/pdfft?md5=357448bf67a0e642791d47ca83954e45&pid=1-s2.0-S0927537124000897-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-29DOI: 10.1016/j.labeco.2024.102597
Michele Bavaro , Federico Tullio
We study the extent of persistence in unemployment and low-pay employment in Italy in the period 2014-2017, using the Italian component of the EU-SILC survey merged with administrative data. We model persistence in unemployment and low-pay employment using different dynamic random-effects models accounting for observed and latent individual heterogeneity as well as endogeneity of the initial conditions. We find evidence of true state dependence in place for both unemployment and low-pay employment. Moreover, past unemployment spells increase the probability of being low-paid, conditional on being employed, while the opposite effect is limited. For both processes the degree of reliance on the previous state is considerably greater than the magnitude of cross-effects. Thus, evidence is presented that these processes shape almost independent no-pay/low-pay tunnels leading individuals into two different traps, rather than a cycle between the two states.
{"title":"A cycle or a tunnel? A study on unemployment and low-pay dynamics in Italy","authors":"Michele Bavaro , Federico Tullio","doi":"10.1016/j.labeco.2024.102597","DOIUrl":"https://doi.org/10.1016/j.labeco.2024.102597","url":null,"abstract":"<div><p>We study the extent of persistence in unemployment and low-pay employment in Italy in the period 2014-2017, using the Italian component of the EU-SILC survey merged with administrative data. We model persistence in unemployment and low-pay employment using different dynamic random-effects models accounting for observed and latent individual heterogeneity as well as endogeneity of the initial conditions. We find evidence of true state dependence in place for both unemployment and low-pay employment. Moreover, past unemployment spells increase the probability of being low-paid, conditional on being employed, while the opposite effect is limited. For both processes the degree of reliance on the previous state is considerably greater than the magnitude of cross-effects. Thus, evidence is presented that these processes shape almost independent no-pay/low-pay tunnels leading individuals into two different traps, rather than a cycle between the two states.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102597"},"PeriodicalIF":2.2,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0927537124000927/pdfft?md5=f9dc690d84f24e103a7ac5b420aba4a7&pid=1-s2.0-S0927537124000927-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-29DOI: 10.1016/j.labeco.2024.102590
Michel Grosz
I estimate the effect of attending an associate degree in nursing program on nursing licensure. I use student-level academic data for all California community college students, matched to public records on all nursing licenses earned in the state. I produce causal estimates using random variation from admissions lotteries at a large nursing program. Enrolling in the program increases the probability of having an active nursing license by 59 percentage points within three years. By seven years the effect is smaller and not statistically significant. I estimate the value of a nursing license as approximately $5000-$6000 per year.
{"title":"Community colleges and careers: Evidence from nursing school lotteries","authors":"Michel Grosz","doi":"10.1016/j.labeco.2024.102590","DOIUrl":"10.1016/j.labeco.2024.102590","url":null,"abstract":"<div><p>I estimate the effect of attending an associate degree in nursing program on nursing licensure. I use student-level academic data for all California community college students, matched to public records on all nursing licenses earned in the state. I produce causal estimates using random variation from admissions lotteries at a large nursing program. Enrolling in the program increases the probability of having an active nursing license by 59 percentage points within three years. By seven years the effect is smaller and not statistically significant. I estimate the value of a nursing license as approximately $5000-$6000 per year.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102590"},"PeriodicalIF":2.2,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-25DOI: 10.1016/j.labeco.2024.102595
Elisabeth Leduc , Ilan Tojerow
This paper analyzes subsidies for the domestic services sector, an increasingly popular policy to create employment opportunities for low-skilled workers. Using Belgian administrative data, a differences-in-differences approach, and a shift-share instrumental variable, we estimate the local effects of the policy in targeted industries as well as overall effects on the labor market. We find that domestic service subsidies can increase female employment in the subsidized industries as well as the overall employment rate. This increase in employment is primarily driven by an increase in (formal) labor market participation and, to a lesser extent, a reduction in the rate of participation in unemployment insurance and in other social welfare programs. We also find that these subsidies can lead to an increase in the rate of work incapacity, likely due to the fact they broaden the population that can access the social safety net.
{"title":"Home work: Exploring the labor market effects of subsidizing domestic services","authors":"Elisabeth Leduc , Ilan Tojerow","doi":"10.1016/j.labeco.2024.102595","DOIUrl":"10.1016/j.labeco.2024.102595","url":null,"abstract":"<div><p>This paper analyzes subsidies for the domestic services sector, an increasingly popular policy to create employment opportunities for low-skilled workers. Using Belgian administrative data, a differences-in-differences approach, and a shift-share instrumental variable, we estimate the local effects of the policy in targeted industries as well as overall effects on the labor market. We find that domestic service subsidies can increase female employment in the subsidized industries as well as the overall employment rate. This increase in employment is primarily driven by an increase in (formal) labor market participation and, to a lesser extent, a reduction in the rate of participation in unemployment insurance and in other social welfare programs. We also find that these subsidies can lead to an increase in the rate of work incapacity, likely due to the fact they broaden the population that can access the social safety net.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102595"},"PeriodicalIF":2.2,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0927537124000903/pdfft?md5=99a5e88ab4144f34b81a915986364737&pid=1-s2.0-S0927537124000903-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-22DOI: 10.1016/j.labeco.2024.102593
Mareen Bastiaans , Robert Dur , Anne C. Gielen
In many Western countries, a sizeable group of people live on welfare benefits for a long time. Many of them suffer from mental health issues. This paper studies the labor market and mental health effects of an activation program targeting these long-term inactive people. We exploit the staggered implementation of the program in a difference-in-differences design. We find that the activation program does not affect labor market outcomes of men and women. However, among men who were on mental health medication prior to the start of the program, we find a substantial drop in mental health drug prescriptions in the years following the start of the program.
{"title":"Activating the long-term inactive: Labor market and mental health effects","authors":"Mareen Bastiaans , Robert Dur , Anne C. Gielen","doi":"10.1016/j.labeco.2024.102593","DOIUrl":"10.1016/j.labeco.2024.102593","url":null,"abstract":"<div><p>In many Western countries, a sizeable group of people live on welfare benefits for a long time. Many of them suffer from mental health issues. This paper studies the labor market and mental health effects of an activation program targeting these long-term inactive people. We exploit the staggered implementation of the program in a difference-in-differences design. We find that the activation program does not affect labor market outcomes of men and women. However, among men who were on mental health medication prior to the start of the program, we find a substantial drop in mental health drug prescriptions in the years following the start of the program.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102593"},"PeriodicalIF":2.2,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0927537124000885/pdfft?md5=d3374cd2d188165b7cadfe833a9c939f&pid=1-s2.0-S0927537124000885-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-19DOI: 10.1016/j.labeco.2024.102592
Krishna Regmi
This study investigates whether the minimum wage affects the uptake of Supplemental Security Income (SSI). To disentangle the effect of the minimum wage from underlying macroeconomic conditions, I use a triple-differences-type model that exploits cross-state and temporal differences in the minimum wage and its differential effects on those individuals with and without a high school diploma. I find that a one percent increase in the minimum wage leads to a 0.33 percent decline in SSI uptake. The effect is concentrated in unmarried individuals, who are more likely to face financial constraints and thus meet income and resource thresholds for collecting SSI.
{"title":"Minimum wages and the uptake of Supplemental Security Income","authors":"Krishna Regmi","doi":"10.1016/j.labeco.2024.102592","DOIUrl":"https://doi.org/10.1016/j.labeco.2024.102592","url":null,"abstract":"<div><p>This study investigates whether the minimum wage affects the uptake of Supplemental Security Income (SSI). To disentangle the effect of the minimum wage from underlying macroeconomic conditions, I use a triple-differences-type model that exploits cross-state and temporal differences in the minimum wage and its differential effects on those individuals with and without a high school diploma. I find that a one percent increase in the minimum wage leads to a 0.33 percent decline in SSI uptake. The effect is concentrated in unmarried individuals, who are more likely to face financial constraints and thus meet income and resource thresholds for collecting SSI.</p></div>","PeriodicalId":48153,"journal":{"name":"Labour Economics","volume":"90 ","pages":"Article 102592"},"PeriodicalIF":2.2,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141478886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"经济学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}