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Sahamkhadam, M., Stephan, A. & Okhrin, Y. (2025). A Copula-Augmented Nelson-Siegel Model for ESG Bond Portfolio Optimization. Journal of Fixed Income, 35(2)
Öppna denna publikation i ny flik eller fönster >>A Copula-Augmented Nelson-Siegel Model for ESG Bond Portfolio Optimization
2025 (Engelska)Ingår i: Journal of Fixed Income, ISSN 1059-8596, E-ISSN 2168-8648, Vol. 35, nr 2Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This article presents a novel copula-based no-arbitrage pricing framework for forecasting bond returns and optimizing bond portfolios. Extending the dynamic Nelson-Siegel model with regular vine copulas for term structure dependencies, we generate step-ahead forecasts for zero-coupon bond yields, which we subsequently apply to obtain and simulate the no-arbitrage prices for both callable and non-callable fixed-coupon bonds. These simulated bond prices serve as inputs for a novel convex multiobjective portfolio optimization, incorporating key criteria such as ESG score, average return, Conditional Value-at-Risk (CVaR), distance-to-default, transaction cost, and option-adjusted duration and convexity. Applying our methodology to a dataset of 879 corporate bonds denominated in euros from January 2016 to July 2024, we demonstrate that the suggested copula-based no-arbitrage pricing framework takes advantage of the yield curve non-linear dependence structure and offers bond portfolios that consistently outperform those portfolios based on the classical dynamic Nelson-Siegel approach and an equally weighted (EQW) benchmark in terms of higher returns and Sharpe ratios while effectively reducing tail risk.

Ort, förlag, år, upplaga, sidor
With Intelligence LLC, 2025
Nationell ämneskategori
Ekonomi och näringsliv
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-142475 (URN)10.3905/jfi.2025.1.221 (DOI)
Tillgänglig från: 2025-11-14 Skapad: 2025-11-14 Senast uppdaterad: 2025-12-22Bibliografiskt granskad
Tosin Aladejana, J., Ahmed, S. A., Voogt, B., Naydenov, V., Nordänger, S., Sala, C., . . . Hosseinpourpia, R. (2025). Evaluation of tall oil behavior as a bio-based hydrophobic additive in fibreboards. In: Reza Hosseinpourpia;Sheikh Ali Ahmed (Ed.), 21st Annual Meeting of the Northern European Network for Wood Science and Engineering WSE 2025: Book of Abstracts. Paper presented at 21st Annual Meeting of the Northern European Network for Wood Science and Engineering, Växjö, Sweden, 8-9 October, 2025 (pp. 198-200). Linnaeus University Press
Öppna denna publikation i ny flik eller fönster >>Evaluation of tall oil behavior as a bio-based hydrophobic additive in fibreboards
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2025 (Engelska)Ingår i: 21st Annual Meeting of the Northern European Network for Wood Science and Engineering WSE 2025: Book of Abstracts / [ed] Reza Hosseinpourpia;Sheikh Ali Ahmed, Linnaeus University Press, 2025, s. 198-200Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Linnaeus University Press, 2025
Nyckelord
Hydrowax, Tall oil, Hydrophobic agent, High-density fibreboard
Nationell ämneskategori
Trävetenskap
Forskningsämne
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-143219 (URN)
Konferens
21st Annual Meeting of the Northern European Network for Wood Science and Engineering, Växjö, Sweden, 8-9 October, 2025
Projekt
TallBoard: Tall oil application in industrial fiberboards
Tillgänglig från: 2025-11-27 Skapad: 2025-11-27 Senast uppdaterad: 2025-12-18Bibliografiskt granskad
Dahlström, P., Lööf, H., Sjöholm, F. & Stephan, A. (2025). The EU's comparative advantage in the "clean-energy arms race". The annals of regional science, 74(1), Article ID 14.
Öppna denna publikation i ny flik eller fönster >>The EU's comparative advantage in the "clean-energy arms race"
2025 (Engelska)Ingår i: The annals of regional science, ISSN 0570-1864, E-ISSN 1432-0592, Vol. 74, nr 1, artikel-id 14Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The net-zero agreement on carbon emission from Paris 2015 gives a key role to fossil-free energy technologies with an expected multiple growth rate over the coming decades, when successively replacing oil, coal, and gas. In this paper, we examine the EU's comparative advantage in the evolving trade war in clean-energy and show that the EU excels in developing strategic net-zero technologies, but often falls short in manufacturing the final products. The EU's Net-Zero Industry Act aims to encourage investments in the production of strategic energy products and increase self-sufficiency to meet 40% of low-carbon technology needs by 2030. However, this may not fully address long-term challenges relating to growth, job creation, decarbonization, and geopolitical resilience. Supporting innovative producers could be a more effective policy to capitalize on the EU's competitive advantage in the clean- energy sector.

Ort, förlag, år, upplaga, sidor
Springer, 2025
Nyckelord
F02, O18, R10, Q50
Nationell ämneskategori
Ekonomi och näringsliv
Forskningsämne
Ekonomi
Identifikatorer
urn:nbn:se:lnu:diva-134816 (URN)10.1007/s00168-024-01343-5 (DOI)001396041800001 ()2-s2.0-85217506289 (Scopus ID)
Tillgänglig från: 2025-02-06 Skapad: 2025-02-06 Senast uppdaterad: 2025-02-24Bibliografiskt granskad
Petreski, A., Schaefer, D. & Stephan, A. (2025). The Reputation Effect of Repeated Green-Bond Issuance and Its Impact on the Cost of Capital. Business Strategy and the Environment, 34(2), 2436-2448
Öppna denna publikation i ny flik eller fönster >>The Reputation Effect of Repeated Green-Bond Issuance and Its Impact on the Cost of Capital
2025 (Engelska)Ingår i: Business Strategy and the Environment, ISSN 0964-4733, E-ISSN 1099-0836, Vol. 34, nr 2, s. 2436-2448Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This study explores the effect of frequent green-bond issuance on a firm's financing costs. Using a sample of listed Swedish real estate companies issuing a total of 1074 bonds over the period from 2011 to 2021, difference-in-differences analyses and instrumental variable estimations are applied to identify the causal impact of frequent green-bond vis-& agrave;-vis frequent non-green-bond issuance on a firm's cost of capital and credit rating. The paper argues that repetitive issuance lowers a firm's cost of capital, while the effects of first or one-time green-bond issuance are the opposite. In line with the reputation capital hypothesis, issuing green bonds even lowers the firm's cost of equity capital, while issuing non-green bonds does not affect the cost of equity.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2025
Nyckelord
bond issuance, ESG, green debt, greenwashing risk, reputation capital
Nationell ämneskategori
Företagsekonomi
Forskningsämne
Ekonomi, Företagsekonomi
Identifikatorer
urn:nbn:se:lnu:diva-134353 (URN)10.1002/bse.4111 (DOI)001381850300001 ()2-s2.0-85212769904 (Scopus ID)
Tillgänglig från: 2025-01-09 Skapad: 2025-01-09 Senast uppdaterad: 2025-02-10Bibliografiskt granskad
Mutarindwa, S., Schäfer, D. & Stephan, A. (2024). Certification against greenwashing in nascent bond markets: lessons from African ESG bonds. Eurasian Economic Review (EAER), 14, 149-173
Öppna denna publikation i ny flik eller fönster >>Certification against greenwashing in nascent bond markets: lessons from African ESG bonds
2024 (Engelska)Ingår i: Eurasian Economic Review (EAER), ISSN 1309-422X, Vol. 14, s. 149-173Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Africa is one of the most vulnerable continents to climate change. Climate and sustainability-linked bonds can provide funding to African governments and corporations for projects that help to mitigate climate change, combat biodiversity loss, and foster sustainable development. However, less than 0.3% of the global environmental, social, governance (ESG) bond issuance volume is devoted to projects in Africa. Based on the entire universe of 107 African ESG bonds from 42 governmental and corporate issuers over the period 2010–2023, this paper establishes that ESG bonds provide benefits to both issuers and investors in terms of lower spreads and volatility. Our econometric results highlight that greenwashing is a valid concern for investors in African ESG bonds and certification of ESG bonds makes a difference vis-à-vis the self-labeling of green bonds. Non-certified ESG bonds do not offer similar benefits compared to certified ones. Green macro-financial policy and suitable regulation to prevent greenwashing can foster African ESG-bond markets.

Ort, förlag, år, upplaga, sidor
Springer Nature, 2024
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-127824 (URN)10.1007/s40822-023-00257-5 (DOI)001162961200003 ()2-s2.0-85185099367 (Scopus ID)
Tillgänglig från: 2024-02-17 Skapad: 2024-02-17 Senast uppdaterad: 2025-08-07Bibliografiskt granskad
Baum, C. F., Lööf, H., Stephan, A. & Zimmermann, K. F. (2024). Estimating the Wage Premia of Refugee Immigrants: Lessons from Sweden. Industrial & labor relations review, 77(4), 562-597
Öppna denna publikation i ny flik eller fönster >>Estimating the Wage Premia of Refugee Immigrants: Lessons from Sweden
2024 (Engelska)Ingår i: Industrial & labor relations review, ISSN 0019-7939, E-ISSN 2162-271X, Vol. 77, nr 4, s. 562-597Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This article examines the wage earnings of refugee immigrants in Sweden. Using administrative employer-employee data from 1990 onward, approximately 100,000 refugee immigrants who arrived between 1980 and 1996 and were granted asylum are compared to a matched sample of native-born workers. Employing recentered influence function (RIF) quantile regressions to wage earnings for the period 2011-2015, the occupational-task-based Oaxaca-Blinder decomposition approach shows that refugees perform better than natives at the median wage, controlling for individual and firm characteristics. This overperformance is attributable to female refugee immigrants. Given their characteristics, refugee immigrant females perform better than native females across all occupational tasks studied, including non-routine cognitive tasks. A notable similarity of the wage premium exists among various refugee groups, suggesting that cultural differences and the length of time spent in the host country do not have a major impact.

Ort, förlag, år, upplaga, sidor
Sage Publications, 2024
Nyckelord
refugees, wage earnings gap, occupations, gender, employer-employee data, job-tasks, recentered influence function (RIF) quantile regressions
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-131730 (URN)10.1177/00197939241261640 (DOI)001250710500001 ()2-s2.0-85197642461 (Scopus ID)
Tillgänglig från: 2024-08-14 Skapad: 2024-08-14 Senast uppdaterad: 2024-09-05Bibliografiskt granskad
Baum, C. F., Lööf, H., Stephan, A. & Zimmermann, K. F. (2024). Estimating the wage premia of refugee immigrants: Lessons from Sweden. Institutionen för nationalekonomi och statistik, Linnéuniversitetet
Öppna denna publikation i ny flik eller fönster >>Estimating the wage premia of refugee immigrants: Lessons from Sweden
2024 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

This paper examines the wage earnings of fully-employed refugee immigrants in Sweden. Using administrative employer-employee data from 1990 and onwards, about 100,000 refugee immigrants who arrived between 1980 and 1996 and were granted asylum are compared to a matched sample of native-born workers. Employing recentered influence function (RIF) quantile regressions for the period 2011–2015 to wage earnings, the occupational task-based Oaxaca–Blinder decomposition approach shows that refugees perform better than natives at the median wage, controlling for individual and firm characteristics. This overperformance is due to female refugee immigrants, who have higher wages than comparable native-born female peers up to the 8th decile of the wage distribution. Refugee immigrant females perform better than native females across all occupational tasks studied, including non-routine cognitive tasks. A remarkable similarity exists in the relative wage distributions among various refugee groups, suggesting that cultural differences and the length of time spent in the host country do not significantly affect their labor market performance.

Ort, förlag, år, upplaga, sidor
Institutionen för nationalekonomi och statistik, Linnéuniversitetet, 2024. s. 26
Serie
Working papers in economics and statistics ; 2024:3
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-127666 (URN)10.15626/ns.wp.2024.03 (DOI)9789180821322 (ISBN)
Anmärkning

Working paper

Tillgänglig från: 2024-02-09 Skapad: 2024-02-09 Senast uppdaterad: 2024-10-22Bibliografiskt granskad
D’Orazio, P., Schäfer, D. & Stephan, A. (2024). Macro-financial policy at the crossroad: addressing climate change, biodiversity loss, and environmental degradation - introduction to the special issue. Eurasian Economic Review, 14(1), 1-11
Öppna denna publikation i ny flik eller fönster >>Macro-financial policy at the crossroad: addressing climate change, biodiversity loss, and environmental degradation - introduction to the special issue
2024 (Engelska)Ingår i: Eurasian Economic Review, ISSN 1309-422X, Vol. 14, nr 1, s. 1-11Artikel i tidskrift, Editorial material (Övrigt vetenskapligt) Published
Abstract [en]

This special issue of the Eurasian Economic Review delves into the critical relationships between macro-financial policy frameworks and environmental sustainability, emphasizing the urgent challenges posed by climate change, biodiversity loss, and environmental degradation. These environmental crises pose significant threats to global economic and financial stability, underscoring the necessity of integrating environmental considerations into macro-financial policies to foster sustainability and resilience in economic policymaking. Through a collection of research papers, this issue explores innovative strategies for developing comprehensive policy frameworks that harmonize monetary, financial, and fiscal policies with environmental objectives. It emphasizes the need for advanced methods to assess and manage the financial risks of climate change and environmental degradation. Underscoring the need for a multidisciplinary approach, the research advocates for the collaboration of economists, environmental scientists, policymakers, and stakeholders to develop effective macro-financial policies. These policies aim to mitigate environmental risks, enhance environmental sustainability, and preserve biodiversity. The issue calls for further research to refine models that accurately predict the macro-financial impacts of environmental risks and assess the effectiveness of policy measures, paving the way for a sustainable future in the face of escalating environmental challenges.

Ort, förlag, år, upplaga, sidor
Springer, 2024
Nyckelord
Climate risks, Environmental risks, Financial stability, Fiscal policies, Monetary policies
Nationell ämneskategori
Ekonomi och näringsliv
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-128363 (URN)10.1007/s40822-024-00265-z (DOI)001187453900001 ()2-s2.0-85188144212 (Scopus ID)
Tillgänglig från: 2024-03-20 Skapad: 2024-03-20 Senast uppdaterad: 2024-06-04Bibliografiskt granskad
Sahamkhadam, M. & Stephan, A. (2024). Socially responsible multiobjective optimal portfolios. Journal of the Operational Research Society, 75(10), 2065-2076
Öppna denna publikation i ny flik eller fönster >>Socially responsible multiobjective optimal portfolios
2024 (Engelska)Ingår i: Journal of the Operational Research Society, ISSN 0160-5682, E-ISSN 1476-9360, Vol. 75, nr 10, s. 2065-2076Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This article extends the socially responsible multiobjective problem to (i) estimating optimal portfolios via reward/risk maximization, (ii) including dependence structure between asset returns using vine copulas, and (iii) incorporating enhanced indexation utilizing cumulative zero-order stochastic dominance (CZϵSD). Applying the multiobjective optimal portfolio (MOOP) approach to a sample of EuroStoxx 50 constituents, the results show that the MOOPs provide investors with the flexibility to incorporate different objectives while investing in optimal portfolios. Including social responsibility results in lower portfolio return and economic performance, but at the same time portfolio risk, expected shortfall of portfolio returns below the benchmark, and turnover are reduced. The copula-based predictive models lead to MOOPs with higher returns and reward/risk ratios. Moreover, optimizing environmental scores leads to less risky MOOPs, while optimizing social scores results in higher average return and better risk-adjusted performance.

Ort, förlag, år, upplaga, sidor
Taylor & Francis Group, 2024
Nyckelord
Finance, multiobjective portfolio, reward/risk maximization, vine copula, conditional value at risk, zero-order stochastic dominance
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Ekonomi
Identifikatorer
urn:nbn:se:lnu:diva-127650 (URN)10.1080/01605682.2024.2303075 (DOI)001153199300001 ()2-s2.0-85183872841 (Scopus ID)
Tillgänglig från: 2024-02-09 Skapad: 2024-02-09 Senast uppdaterad: 2025-08-07Bibliografiskt granskad
Schäfer, D., Stephan, A. & Fuhrmeister, S. (2024). The impact of public procurement on financial barriers to general and green innovation. Small Business Economics, 62, 939-959
Öppna denna publikation i ny flik eller fönster >>The impact of public procurement on financial barriers to general and green innovation
2024 (Engelska)Ingår i: Small Business Economics, ISSN 0921-898X, E-ISSN 1573-0913, Vol. 62, s. 939-959Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This study investigates whether public procurement mitigates or exacerbates innovative enterprises’ financial constraints. We distinguish between general and environmentally beneficial innovative enterprises. Theory suggests that the treatment effects of public procurement, particularly when mediated by the demand-pull effect, may lower a company’s funding constraints for innovation. We test this theory with extended probit models allowing for endogenous treatment and selection. The findings reveal a significantly positive treatment effect of public procurement on the probability of facing financial constraints in both areas: general and environmentally beneficial innovative activities. Thus, the principal implications of this study are (1) that being an innovating SME exacerbates financial constraints and (2) that strengthening SMEs’ participation in European public tenders would not contribute to lowering SMEs’ financial constraints. On the contrary, complementary grants or other financial incentives might be necessary to substantially increase the SMEs’ bidding rates in public tenders.

Ort, förlag, år, upplaga, sidor
Springer, 2024
Nyckelord
Public procurement, Financial constraints. General innovation, Green financial constraints, Environmentally beneficial innovation, Small and medium-sized enterprises, Sustainable finance, Green fiscal policy
Nationell ämneskategori
Nationalekonomi
Forskningsämne
Ekonomi, Nationalekonomi
Identifikatorer
urn:nbn:se:lnu:diva-123355 (URN)10.1007/s11187-023-00790-2 (DOI)001034482400001 ()2-s2.0-85165566488 (Scopus ID)
Forskningsfinansiär
Europeiska kommissionen, 857831
Tillgänglig från: 2023-07-25 Skapad: 2023-07-25 Senast uppdaterad: 2025-08-07Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-5776-9396

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