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Sustainability level of the pearl lobster(Panulirus ornatus)aquaculture business using the systems of floating-net cage and fixed-net cage:A case study in South Sulawesi Province,Indonesia

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Aquaculture and Fisheries 2024年第5期9卷 851-859页

作者： Nimmi Zulbainarni Muhammad Hairul Haj Novindra school of Business Bogor Agricultural InstituteBogor16143Indonesia Tropical Marine economics Study Program Bogor Agricultural InstituteBogor16680Indonesia Department of resource economics and Environment Bogor Agricultural InstituteBogor16680Indonesia

Marine aquaculture is currently the fastest-growing seafood industry globally,offering a potential solution to overfishing problems,while enhancing food security and income *** Sulawesi,a province in Indonesia,is rich in aquaculture resources,one of which is *** two commonly used aquaculture systems are the floating-net cage(KJA)and fixed-net cage(KJD).The growing market demand and rising lobster prices pose a threat to resource sustainability due to *** is issue have to be addressed to achieve sustainable fishery *** is the primary focus on global fishery *** to the United Nations,sustainable development encompasses three dimensions:the economy,social and ***,sustainable fishery,particularly aquaculture,relies on obtaining significant benefits while minimizing environmental ***,this study aimed to analyze the sustainability level of the pearl lobster(Panulirus ornatus)aquaculture in South Sulawesi,based on the provided background *** study included a sample of 62 *** sample selection involved the use of the stratified sampling method,with 51 farmers from(KJA)and 11 farmers from(KJD).The sustainability analysis,conducted through assessment of based farmers’perceptions,served as the analytical *** findings revealed that pearl lobster(Panulirus ornatus)aquaculture has a medium level of *** Integrated Multi Tropic Aquaculture(IMTA)and Regional Integrated Multi Tropic Aquaculture(RIMTA)techniques is a recommended sustainability level.

关键词： Cage Sustainability Pearl Lobster South Sulawesi Province Indonesia

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Can whole steps of grain production be outsourced? Empirical analysis based on the three provinces of Jiangsu,Jilin,and Sichuan in China

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Journal of Integrative Agriculture 2024年第1期23卷 336-347页

作者： Jiacheng Liu Shengzhi Mao Qiufen Zheng Zhigang Xu school of Finance and Taxation Nanjing University of Finance and EconomicsJiangsu 210023China school of economics Southwestern University of Finance and EconomicsSichuan 611130China school of economics and Management Nanjing Agricultural UniversityJiangsu 210095China

Certain outsourcing services for agricultural management in China,such as pest control in grain production,have experienced prolonged sluggishness,contrasting with the relatively high level of outsourcing services observed in harvesting,land preparation,and *** study examines the feasibility of implementing whole-step outsourcing in grain production by conducting a case study of rice and maize production in Jiangsu,Jilin,and Sichuan provinces in *** provision of outsourcing services hinges on two essential conditions:technological advancements fostering specialized production and economies of scale,coupled with a market size sufficient to realize the aforementioned potential economies of *** results showed that outsourcing pest control or harvesting services had varying economies of *** outsourcing services in pest control were less common than in harvesting services,and their marginal growth space of the economies of scale with technological change was also *** by the operational characteristics of pest control itself,the market scale of its professional services is ***,achieving the whole-step outsourcing of grain production necessitates not only technological innovation but also effective policy interventions to overcome the constraints of market *** interventions include(1)optimizing crop layouts between planning regions and reducing land fragmentation and(2)supplying timely and effective inter-regional agricultural information for service providers aided by information technology.

关键词： outsourcing services economy of scale technical conditions market scale

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Carbon compensation and carbon neutrality:Regional variations based on net carbon transfer of trade in China

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Geoscience Frontiers 2024年第4期15卷 159-175页

作者： Xue Han Xincai Gao Fayyaz Ahmad Abbas Ali Chandio Salim Khan school of economics Lanzhou UniversityLanzhou 730000GansuChina College of economics Sichuan Agricultural UniversityChengdu 611130China school of Management Guangzhou UniversityGuangzhou 510006China

Inter-provincial carbon compensation is an important means for a country to realize regional environmental protection and achieve coordinated regional development and realize the carbon neutral *** is easier to realize inter-provincial carbon compensation compared with the national *** on the multi-regional input-output model and the input-output data of 30 provinces in China,this study measured the carbon transfer in,carbon transfer out and net carbon transfer of each province,and based on the undesirable slacks-based measurement model under the common frontier,the provinces were given the shadow price of carbon emission in line with the situation of the local economic development,resource endowment,and industrial structure,and based on which,the amount of carbon compensation of each province was *** results show that:China's provinces and regions have a larger share of trade-implied carbon emissions;the net carbon transfer in areas mainly concentrated in the traditional energy provinces,which provide industrial products for other regions and undertake the transfer of carbon emissions,and become the main carbon compensation recipient areas;the net carbon transfer out is mainly concentrated in the economically developed and densely populated areas such as Beijing-Tianjin region and the eastern and southern coasts,which satisfy the end-consumption by purchasing a large number of industrial products and generate a large amount of carbon *** out;becoming the main carbon offset payment *** on the results of this study,it is proposed to improve the national provincial carbon offset mechanism and implement a differentiated and synergistic carbon emission reduction cooperation *** research program of this study can provide a reference for the development of inter-regional carbon offset programs.

关键词： Carbon transfer Shadow price Carbon emission responsibility Carbon compensation

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Will the State-owned Capital Transfer Policy Enhance the Sustainability of the Urban Employee Basic Pension Insurance Fund in China?

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China & World Economy 2024年第3期32卷 98-129页

作者： Jia Wang Huan Liu Mei Li Han Li school of economics Xiamen UniversityChina school of economics and Management Nanjing Agricultural UniversityChina school of economics and Management Wuhan UniversityChina

To analyze the efect of the state-owned capital transfer policy on the sustainability of China's urban employee basic pension insurance fund(CUEBPIF),this study develops an actuarial model for pension *** results reveal the following:(i)Without policy intervention,the CUEBPIF would face a deficit in 2027 and a cumulative shortfall of RMB207.44 trillion by 2050,and the proportion of fiscal subsidies for the CUEBPIF in the total fiscal expenditure would increase to 12.86 percent in 2050.(i)Based on a delayed retirement policy,the transfer of 10 percent of state-owned capital can delay the onset of the fund deficit by 6 years,and the accumulated shortfall in 2050 would fall to RMB39.42 trillion,and the proportion of fiscal subsidies would decrease by I1.77 percentage points.(ii)The state-owned capital transfer policy can improve the sustainability of the CUEBPIF and reduce the burden of enterprise social security contributions when the transfer ratio increases to 20 percent.

关键词： burden of enterprise social security contributions delayed retirement policy state-owned capital transfer policy sustainability of basic pension insurance fund

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Understanding the determinants of household cooking-fuel choice in sub-Saharan Africa:evidence from Nigeria

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Clean Energy 2024年第2期8卷 144-155页

作者： Raheem Olatunji Aminu Maxwell Adizor Dzudzor Funminiyi Peter Oyawole Samson Oluwaseyi Afolayan school of Agriculture Policy and DevelopmentUniversity of ReadingReadingUK Department of agricultural economics and Farm Management Federal University of Agriculture AbeokutaOgun StateNigeria Department of agricultural economics and Agribusiness University of GhanaAccraGhana

Overreliance on traditional cooking fuels by agricultural households poses a significant obstacle to achieving the United Nations Sustainable Development Goal 7 by 2030 in *** the emerging recognition of remittances as a crucial factor influencing cooking-fuel choices in the energy-transition literature,there is a paucity of studies examining this influence in *** data from 4400 agricultural households sourced from the fourth wave of the Nigerian Living Standard Measurement Survey data sets,this study examined the influence of remittances on cooking-fuel choices,among other factors in *** descriptive statistics and the multinomial logit regression model,the analysis reveals that traditional cooking fuels,including wood,crop residue and animal dung,continue to dominate the cooking-fuel *** empirical result of the multinomial logit model showed that households that receive remittances are more likely to use modern cooking ***,wealthier,more educated households with access to electricity are more likely to use modern and transitional cooking fuels than traditional cooking *** on the findings,the study suggests the incentivization of remittances into the country through the reduction in associated transaction costs and accelerated public infrastructural investment in affordable electricity and good road networks to connect rural areas to gas-supply networks to drive the transition to modern cooking ***,educational and awareness campaigns about the health risks associated with traditional cooking energy,particularly indoor air pollution,should be encouraged,especially in rural areas.

关键词： agricultural households cooking fuels energy ladder Nigeria remittance SDG 7

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ON DIVIDENDS AND GERBER-SHIU ANALYSIS WITH CONSTANT INTEREST AND A PERIODIC-THRESHOLD MIXED STRATEGY

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Acta Mathematica Scientia 2024年第6期44卷 2139-2164页

作者：刘章陈平 school of Computer and Information Engineering Jiangxi Agricultural University Department of economics The University of Melbourne

In recent years,the research focus in insurance risk theory has shifted towards multi-type mixed dividend ***,the practical factors and constraints in financial market transactions,such as interest rates,tax rates,and transaction fees,inevitably impact these *** incorporating appropriate constraints,a multi-type mixed strategy can better simulate real-world *** the approach of Liu et al.[28],we examine a classical compound Poisson risk model that incorporates the constraints of constant interest rates and a periodic-threshold mixed dividend *** this model,the surplus process of insurance companies is influenced by several *** factors include constant interest rates,continuously distributed dividends within intervals(threshold dividend strategy),and dividends at discrete time points(periodic dividend strategy).We derive the piecewise integro-differential equations(IDEs) that describe the expected present value of dividends(EPVDs) until ruin time and the Gerber-Shiu expected discounted penalty ***,we provide explicit solutions to these IDEs using an alternative method based on the inverse Laplace transform combined with the Dickson-Hipp *** enables us to obtain explicit expressions for the dividend and Gerber-Shiu ***,we present examples to illustrate the application of our results.

关键词： 35B10 Cramér-Lundberg model EPVDs Gerber-Shiu function interest mixed dividend strategy

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Are gender inclusiveness and rural transformation interlinked?The case of Bangladesh

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Journal of Integrative Agriculture 2024年第6期23卷 2112-2126页

作者： Maria Fay Rola-Rubzen Mohammad Jahangir Alam Jon Marx Sarmiento Ismat Ara Begum Al Amin Al Abbasi Subrata Saha UWA school of Agriculture and Environment The University of Western AustraliaPerth 6009Australia Department of Agribusiness and Marketing Bangladesh Agricultural UniversityMymensingh-2202Bangladesh Department of agricultural economics Bangladesh Agricultural UniversityMymensingh-2202Bangladesh

Gender inclusiveness is important in the rural transformation process of Bangladesh as rural women play key roles in both agricultural and non-agricultural *** inclusiveness also leads to gender *** empirically evaluate relationships between rural transformation and gender inclusiveness in *** consider three rural transformation indicators:high-value commodities’share in agricultural output values,non-farm employment’s share in rural labor employment,and non-agricultural GDP’s share in total *** capturing gender inclusiveness include the per capita rural income of males and females,ratio of investments into gender programs,female access to education,access to healthcare,employment participation,land ownership,and asset *** test the effect of the difference in per capita rural income of males and females and the ratio of their incomes and check for the robustness of the gender variables across different model *** 128 district-level observations from 32 districts of Bangladesh across four time periods(2000,2005,2010 and 2016),we use both ordinary least squares and fixed effects panel regression *** find that female land and asset ownership and access to education and healthcare are robust determinants of various stages of rural ***,our results suggest that improving women’s ownership of land and assets and investing in women’s education and healthcare will likely contribute to a more inclusive rural transformation.

关键词： rural transformation Bangladesh gender inclusiveness investments on women

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Does Green Food Certification promote agri-food export quality?Evidence from China

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Journal of Integrative Agriculture 2024年第3期23卷 1061-1074页

作者： Ping Wei Hongman Liu Chaokai Xu Shibin Wen College of economics and Management China Agricultural UniversityBeijing 100083China school of Public Affairs Zhejiang UniversityHangzhou 310058China

The construction of a food certification system plays a vital role in upgrading export quality, which previous studies have largely overlooked. We match China's industry-level data of Green Food Certification with its HS6-digit export data of agri-food products to quantify the impact of Green Food Certification on export quality. We identify the significant and positive effect of Green Food Certification on export quality. The 2SLS estimation based on instrumental variables and a range of robustness checks confirm the validity and robustness of the benchmark conclusions. Further analysis discloses that Green Food Certification improves export quality by raising agricultural production efficiency and brand premiums. Heterogeneity analysis shows that the effect of Green Food Certification varies across regions, notably improving the quality of agri-food products exported to developed regions and regions with high levels of import supervision. Furthermore, among various product types, Green Food Certification significantly improves the export quality of primary products and products vulnerable to non-tariff measures. The above findings could guide the future development of agri-food quality certification systems, potentially leading to a transformation and promotion of the agri-food trade.

关键词： Green Food Certification agri-food products green transformation export quality food labeling

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Downstream Competition and Upstream Innovation:Theory and Evidence from China

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China Finance and Economic Review 2024年第1期13卷 67-87页

作者： Jing Dai Guanchun Liu Ziqi Ye Haiou Mao Yongwei Ye school of Finance Hubei University of Economics Lingnan College Sun Yatsen University school of Business Administration Zhongnan University of Economics and Law College of economics and Management Huazhong Agricultural University school of Public economics and Management Shanghai University of Finance and Economics

Competition is the catalyst of corporate innovation,which is the foundation of a country's core *** the view of vertical industrial chain,this paper examines how downstream competition affects upstream firms'innovation *** innovation helps reduce the production cost of each product,increasing demand of intermediate products caused by downstream competition enhances the marginal revenue of upstream firms'innovation,thus leading to an innovation incentive *** identify causality,we utilize China's WTO accession,a quasinatural experiment,to calculate downstream competition combined with import tariff reduction and input-output table,and then run a difference-in-difference *** the data of Annual Survey of Industrial Firms and State Intellectual Property Office,our results find that downstream competition has a significantly positive impact on upstream firms'innovation,and this effect is more pronounced in firms with less industry competition,greater initial innovation capacity and weaker financial ***,the number of firms,the degree of industry competition and the scale of intermediate products in the downstream sector increase,confirming the market size *** sum,our findings document that downstream competition can motivate upstream firms to innovate through vertical industrial chain,providing some useful insights for China to build a fair market competition environment and promote innovation-driven growth regime.

关键词： downstream competition upstream firms'innovation vertical industrial chain market size effect

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Digital Revolution and Job Quality of Lower Class Workers: Quasi-experimental Evidence from the Broadband China Program

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China & World Economy 2024年第4期32卷 146-178页

作者： Xiumei Wang Ye Jiang Famin Yi school of Business Fuyang Normal UniversityChina Department of economics Dickinson CollegeUSA school of economics and Management South China Agricultural UniversityChina

This study examines the impact of the digital revolution on the job quality of workers with a specific focus on those at the lowest end of the spectrum in China's domestic labor market. Leveraging exogenous timing variations that result from the implementation of the Broadband China Program across different cities, it provides quasi-experimental evidence concerning the effects of the digital revolution on the job quality of lower class workers, particularly rural–urban migrant workers. Using data from China Migrants Dynamic Survey, this study reveals that migrants' comprehensive job quality index increased by 0.0138 (5.33 percent), and its component indices experienced positive effects after the Broadband China Program was implemented. This study also investigates heterogeneous policy treatment effects among workers with diverse demographic and occupational characteristics. Underlying mechanisms are considered, including positive macroeconomic shocks, increased social interactions, and Internet use. In particular, migrants' attitudes toward local settlement became more positive, suggesting that the positive effects of the digital revolution on livelihood lasted for some time. Taking China as an example, this study contributes valuable empirical evidence of how the digital revolution can affect lower class workers' employment or living conditions in a developing country. Related policy implications are also considered.

关键词： Broadband China Program digital revolution job quality lower clas workers rural-urban migrants

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