Dr. Jonas Luckmann
Profil
Forschungsthemen4
Agrargroßbetriebe in Benin – Die Firma Africa Agri Tech und ihre Auswirkungen auf die lokale Lebensgrundlage und Ernährungssicherheit
Quelle ↗Zeitraum: 07/2019 - 01/2020 Projektleitung: Dr. Jonas Luckmann
Auswirkungen landwirtschaftlicher Großinvestitionen auf die lokale Ernährungssicherheit: Eine Fallstudie aus Naivasha, Kenia
Quelle ↗Förderer: Andere inländische Stiftungen Zeitraum: 06/2025 - 12/2025 Projektleitung: Dr. Jonas Luckmann
Entwicklung eines ökonomischen Modellierungsrahmens zur Unterstützung von Entscheidungsträgern im Wassersektor
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 06/2021 - 11/2024 Projektleitung: Dr. Jonas Luckmann
Wie durchführbar ist die Einführung von GMO-Mais in der kleinbäuerlichen Landwirtschaft in Kenia?
Quelle ↗Förderer: Andere inländische Stiftungen Zeitraum: 05/2025 - 12/2025 Projektleitung: Dr. Jonas Luckmann
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Water Resources Research · 64 Zitationen · DOI
Water scarcity is an increasing problem in many parts of the world and the management of water has become an important issue on the political economy agenda in many countries. As water is used in most economic activities and the allocation of water is often a complex problem involving different economic agents and sectors, Computable General Equilibrium (CGE) models have been proven useful to analyze water allocation problems, although their adaptation to include water is still relatively undeveloped. This paper provides a description of an integrated water-focused CGE model (STAGE_W) that includes multiple types and uses of water, and for the first time, the reclamation of wastewater as well as the provision of brackish groundwater as separate, independent activities with specific cost structures. The insights provided by the model are illustrated with an application to the Israeli water sector assuming that freshwater resources available to the economy are cut by 50%. We analyze how the Israeli economy copes with this shock if it reduces potable water supply compared with further investments in the desalination sector. The results demonstrate that the effects on the economy are slightly negative under both scenarios. Counter intuitively, the provision of additional potable water to the economy through desalination does not substantively reduce the negative outcomes. This is mainly due to the high costs of desalination, which are currently subsidized, with the distribution of the negative welfare effect over household groups dependent on how these subsidies are financed.
PLoS ONE · 36 Zitationen · DOI
Organic agriculture (OA) is considered a strategy to make agriculture more sustainable. Bhutan has embraced the ambitious goal of becoming the world's first 100% organic nation. By analysing recent on-farm data in Bhutan, we found organic crop yields on average to be 24% lower than conventional yields. Based on these yield gaps, we assess the effects of the 100% organic conversion policy by employing an economy-wide computable general equilibrium (CGE) model with detailed representation of Bhutan's agricultural sector incorporating agroecological zones, crop nutrients, and field operations. Despite a low dependency on agrochemicals from the onset of this initiative, we find a considerable reduction in Bhutan's GDP, substantial welfare losses, particularly for non-agricultural households, and adverse impacts on food security. The yield gap is the main driver for a strong decline in domestic agricultural production, which is largely compensated by increased food imports, resulting in a weakening of the country's cereal self-sufficiency. Current organic by default farming practices in Bhutan are still underdeveloped and do not apply the systems approach of organic farming as defined in the IFOAM organic farming standards. This is reflected in the strong decline of nitrogen (N) availability to crops in our simulation and bears potential for increased yields in OA. Improvement of soil-fertility practices, e.g., the adoption of N-fixing crops, improved animal husbandry systems with increased provision of animal manure and access to markets with price premium for organic products could help to lower the economic cost of the large-scale conversion.
Water Research · 26 Zitationen · DOI
Water International · 23 Zitationen · DOI
The Grand Ethiopian Renaissance Dam (GERD) is expected to double Ethiopia’s electricity generation and impact River Nile flows to Sudan and Egypt. We analyse potential economy-wide impacts on Sudan of the GERD’s long-term operation using a computable general equilibrium model and outputs of previous studies from biophysical models. Based on a 20% increase in hydropower and an assumed rapid irrigation expansion timeline, the results show that the GERD could help increase Sudan's accumulated gross domestic product (GDP) by US$47-83 billion over the period 2020-60 (excluding initial investment costs and other GERD negative and positive impacts). The choice of crops in new irrigation schemes is key to increasing Sudan’s macro-economic benefits.
Water Resources Management · 20 Zitationen · DOI
AgEcon Search (University of Minnesota, USA) · 12 Zitationen · DOI
This document describes the Israeli Social Accounting Matrix (SAM) for the year 2004, developed by the Agricultural and Food Policy Group at the University of Hohenheim. The SAM is a part of a larger research project which aims to analyse several economic, trade, and labour policies in the context of economic integration of agriculture between Israel and the West Bank. Data are obtained from various sources in Israel. Sources include the Israeli Central Bureau of Statistics (ICBS), the Central Bank of Israel (CBI), and the Israeli Tax Authority (ITA). Data from sources outside of Israel are used to fill-in some gaps in the domestic reports. External sources include the World Trade Organization (WTO), the Organisation for Economic Co-operation and Development (OECD), and the World Bank. The SAM provides data on 47 sectors with activities separated from commodities, 36 labour force types, 10 household groups, as well as 17 tax accounts in addition to 37 accounts reserved for taxes on production factors. A topdown approach is pursued by first building a balanced macro SAM which is consistent with 2004 national account data. Subsequently, the macro SAM is disaggregated into a micro SAM which is balanced in several steps.
Food Security · 11 Zitationen · DOI
Economic Modelling · 10 Zitationen · DOI
Applied Economics · 9 Zitationen · DOI
Most agriculture-based economies in Africa are working on increasing their agricultural productivity and production following the African Union (AU) recommendations.However, it has been shown that increasing agricultural production without ensuring value-chain development may end up in welfare losses for farmers due to falling farm-gate prices.Little research has been conducted so far on the economy-wide effects of food value-chain development.This article contributes to filling this gap by analysing the effects of food-processing sector development on welfare in an agriculture-based economy, taking the example of Benin.We calibrate a Computable General Equilibrium (CGE) model to a comprehensive 2019 Social Accounting Matrix (SAM) for Benin.We introduce a novel welfare measure, accounting for changes in savings.Results show that enhancing the food-processing sector increases demand for agricultural raw materials and hence agricultural production and prices.Accordingly, the price of low-skilled labour increases.This primarily benefits low-income households, who derive most of their income from this factor.The overall income and welfare effects are pro-poor.Accordingly, income disparity as well as poverty incidence and gap decrease.We conclude, that the development of food-processing has the potential to make agricultural development in agriculture-based economies more pro-poor.
Food Policy · 9 Zitationen · DOI
West Africa produces almost half of the world's cashew nuts. With the domestic cashew processing industry still in its infancy, however, most of it is exported as raw material and processed in India and Vietnam. In Ghana, this is provoking discussions about market interventions to support domestic processing. Since different price policies have diverging implications for farmers and processors, the choice of the policy instrument leads to conflicts of interest between the two groups. In this study, we analyse the short- and long-term economic impacts of enhancing cashew processing through (i.) a temporary export tax on raw cashew nuts, (ii.) a temporary subsidy to cashew processors, and (iii.) a temporary export tax on raw cashew nuts, with government revenues passed on to cashew growers. For this purpose, we develop a partial equilibrium model for the Ghanaian cashew market including the processing from raw cashew nuts to kernels. We find that in the short run, all price policies lead to a substantial increase in processing at the expense of net welfare. We argue, however, that the sector may experience productivity gains through learning by doing and thus, after price policies are phased out, stick to its increased level of output such that short-term welfare losses could be recouped. Therefore, temporarily introduced price policies could help the infant cashew processing industry to grow up, promote the development of the domestic cashew sector, and be welfare-enhancing in the long run. A subsidy to processors is the most appropriate option to achieve this.
RePEc: Research Papers in Economics · 7 Zitationen · DOI
The Grand Ethiopian Renaissance Dam (GERD) – a multi-year hydropower storage dam under construction on the Blue Nile River in Ethiopia – is expected to double the Ethiopian electricity generation. The GERD is expected to impact downstream water users in Egypt and Sudan. Several studies assessed the effects of the GERD on water supply and hydropower generation in Sudan and Egypt. However, less attention was given to the economic benefits and costs of GERD operation to the downstream countries. This study analyzes the potential impacts of the steady-state operation of the GERD on Sudan and provides recommendations for short- and medium-term policymaking. We feed a calibrated economy-wide Computable General Equilibrium (CGE) model of Sudan with the expected biophysical impacts of the steady-state operation of the GERD on irrigated agriculture and hydropower generation in the country. The biophysical impacts are obtained from daily hydrological, water allocation, and crop models. We assess three cooperation states between Ethiopia and Sudan on the operation of the GERD: unilateral action, coordination, and collaboration. These cooperation states are examined considering irrigation expansion in the Blue Nile Basin in Sudan based on three possible cropping patterns. The analysis also considers the expected changes to hydropower generation in Sudan. Results suggest that Sudan's accumulated GDP gains from the steady-state operation of the GERD (2020—2060) would range between US$ 27 billion and US$ 29 billion compared to a baseline without the GERD. Results on household welfare for 2020 to 2060 show disparities between the gains of different household groups. High levels of cooperation between Ethiopia and Sudan on the steady-state operation of the GERD can lead to less economic gains if combined with certain cropping patterns in new irrigation schemes compared to lower levels of cooperation.
STAGE_W: An Applied General Equilibrium Model With Multiple Types of Water - Technical Documentation
2014University writing server of the University of Hohenheim (Universität Hohenheim) · 7 Zitationen · DOI
This document provides a description of the STAGE_W computable general equilibrium (CGE) model, which is a development of the STAGE model and allows for the depiction of diverse water resources and qualities as well as the simulation of detailed water policy scenarios. The main extensions of STAGE_W are the integration of various water resources as factors, from which specific activities produce water commodities. These commodities are used as inputs in the production process of other activities or are consumed by households and other agents as final users. Thereby, the number and specification of water factors, activities and commodities are flexible and can be adjusted to the conditions of the country analyzed. Moreover the model allows for the substitution of water commodities by water consuming activities. Besides this, the addition of two water specific tax instruments, allows for various pricing schemes, including price differentiation according to water user. All other features of the STAGE model are carried over directly to STAGE_W.
Labour‐saving technologies in smallholder agriculture: An economy‐wide model with field operations
2023Australian Journal of Agricultural and Resource Economics · 6 Zitationen · DOI
Abstract Labour‐saving technologies are relevant for agricultural development. Yet, as this study shows, they are poorly integrated into agricultural production functions of economy‐wide models. We report a computable general equilibrium (CGE) model, which explicitly incorporating field operations (e.g. land preparation, weeding or harvesting) in the context of smallholder agriculture. The field operations approach allows to model technological trade‐offs in organic and conventional production systems at various stages of the agricultural production process. Simulating a structural change scenario, we compare the performance of the field operations approach with published benchmark production structures by assessing how they replicate empirically observed changes in land and agrochemical use. This benchmark analysis shows that incorporating field operations replicates the observed empirical changes most accurately and allows for more realistic modelling of labour‐saving technologies. We use the field operations model to investigate three policy options to mitigate labour shortages in the agricultural sector of Bhutan. Permitting the employment of Indian workers in agriculture has the highest short‐term potential in this respect. We find that subsidising agricultural machinery hiring services and removing import tariffs on agrochemical inputs are found to be less effective. Further options for model developments, such as combining field operations and labour market seasonality, are highlighted.
Agricultural Economics · 6 Zitationen · DOI
Abstract For rural households in the north of Vietnam, maize cropping is the main source of income. In the face of the world market price increases of the recent past, we analyze the regional marketing chain of this commodity qualitatively and econometrically investigating to what extent smallholder farmers in developing countries are affected by international price movements. Vietnamese maize markets are found to be well integrated. Recent price hikes have fully transmitted along the regional supply chain so that farmers profited. Nevertheless, adverse factors such as increasing input prices have neutralized these benefits resulting in a decline in real income of smallholders.
Food Security · 5 Zitationen · DOI
Abstract Large-scale agricultural investments (LSAIs) and their impacts on local communities in host countries have been controversially discussed in recent years. As scholars increasingly call for more structured and comprehensive analyses, we develop a mixed-method approach using an expanded version of the “Right to Food” (RtF) framework to systematically investigate the local food security impacts of a recently established tomato-producing LSAI in Central Benin, West Africa. We find that the LSAI keeps natural resources as accessible as possible for the local community and provides employment opportunities, leading to higher dietary diversity of employees and multiplier effects in the local economy. At the same time, we find inequalities regarding the compensation of former land users as well as high job insecurity for temporary laborers who face high transportation costs to reach the LSAI. We argue that fair and inclusive compensation, improved access to markets and machinery, access to natural resources for often overlooked groups (pastoralists, hunters, fishermen) and social infrastructure are crucial factors in promoting positive outcomes of LSAIs on communities and that strong local institutions play a key role for achieving this. We conclude that the specific characteristics of our case (relatively small size, labor-intensive crop, focus on regional markets) provide favorable conditions for positive impacts on local food security. We encourage further, structured mixed-method studies, ideally including longitudinal and comparative research designs, to investigate the multidimensional effects related to the establishment of LSAIs. The extended RtF framework can thereby serve as a structural lens to systematically analyze the findings.
RePEc: Research Papers in Economics · 3 Zitationen
In this study, we analyze the effects of increasing Palestinian access to shared groundwater aquifers with Israel. We apply a water focused computable general equilibrium model to the economies of the West Bank and Israel and analyze two simulations. In the first, we raise the water abstraction rate of the West Bank to the maximal allowance according to the current interim agreement on shared water resources with Israel. In the second, we implement a new agreement that assumes an equiproportionate access to shared aquifers. Thereby, we quantify the implications for the two territories as well as for the overall region. Results show that the economic gains from increased water access to the West Bank economy by far outweigh the losses to the Israeli economy, as the latter is less dependent on shared groundwater resources and has other alternative sources including reclaimed wastewater and desalinated seawater. This is the first study to address this issue taking into account the economy-wide implications of such a new agreement on the use of shared water resources between Palestine and Israel. The modelling approach presented here can be used to substantiate the political negotiation process towards a final agreement on access to shared water resources between Israel and the West Bank.
Environmental Modelling & Software · 3 Zitationen · DOI
Can Vietnamese Upland Farmers Profit from High World Market Prices? A Price Transmission Analysis
20113 Zitationen · DOI
2 Zitationen · DOI
This paper analyses the impacts of a water-for-energy swap agreement that has been negotiated between Israel and Jordan in recent years, on the Israeli economy. According to the agreement Israel will supply 200 million m³ of desalinated water to Jordan in exchange for electricity to be produced in a new 600-megawatt solar power plant to be built in Jordan (Mansour & Reiffenstuel, 2022).Given the nexus character of water and energy, which are strongly interlinked with other parts of the economy, we investigate the implications of this agreement using an economy-wide simulation model. Specifically, a water-focused computable general equilibrium (CGE) model is calibrated to a recent, detailed social accounting matrix for Israel, which includes 46 economic sectors, 43 production factors, and 10 household types differentiated according to income level and ethnic group. The model includes a detailed depiction of water supply and demand, considering alternative water sources, such as desalination and reclamation of wastewater, with differing cost structures. To capture price discrimination and other water-related policies applied by the entities investigated, the model includes different water-related taxation instruments and water satellite accounts which allows for keeping track of water quantities.It is expected that Israel will gain from the additional electricity provided, which reduces production costs of energy-intensive sectors, including desalination, a major contributor to municipal water supply. Additionally, there are also gains outside the pure economic modeling: electricity production in the region will become greener and the increased interdependency between the two states will contribute to stabilizing relations and thus peace in the region. Therefore, this agreement can earn a triple dividend covering all aspects of the sustainability triangle.SourceMansour, H., & Reiffenstuel, A. (2022). KAS Studies on Jordan Jordan Office The Jordan, Israel, and UAE Water-for-energy Deal: Potential and Pitfalls of Energy and Water Sharing-Agreements in the Middle East, https://www.kas.de/en/web/jordanien/single-title/-/content/the-jordan-israel-and-uae-water-for-energy-deal.
World Economy · 2 Zitationen · DOI
Abstract This paper quantifies the economy‐wide effects of different trade policies on the Palestinian economy, using a detailed database and a general equilibrium model adjusted to the particularities of the Palestinian economy. The findings show that a liberal and non‐discriminatory trade regime provides the highest benefits for the Palestinian economy, in terms of welfare effects, GDP growth and job creation. The choice of an exchange rate regime has a considerable influence on the effects of trade policy. Accordingly, a full control over trade and monetary policy instruments could improve the capacity of the Palestinian National Authority to address the prevailing high unemployment and sluggish economic growth.
Water Economics and Policy · 2 Zitationen · DOI
AgEcon Search (University of Minnesota, USA) · 2 Zitationen · DOI
Environmental Economics and Policy, International Relations/Trade
AgEcon Search (University of Minnesota, USA) · 2 Zitationen
Water scarcity is an increasing problem in many parts of the world and the management of water has become an important issue on the political economy agenda in many countries. As water is used in most economic activities and the allocation of water is often a complex problem involving different economic agents and sectors, Computable General Equilibrium (CGE) models have been proven useful to analyse water allocation problems, although their adaptation to include water is still relatively undeveloped. This paper provides a description of an integrated CGE model (STAGE_W) that includes multiple types and uses of water, and for the first time, the recycling of wastewater as well as the provision of brackish groundwater as separate, independent activities with specific cost structures. The insights provided by the model are illustrated with an application to the Israeli water sector assuming that fresh water resources available to the economy are cut by 50%. We analyze how the Israeli economy copes with this shock if it reduces potable water supply compared with further investments in the desalination sector. The results demonstrate that the effects are slightly negative under both scenarios. Counter intuitively, the provision of additional potable water to the economy through desalination does not substantively reduce the negative outcomes. This is mainly due to the high costs of desalination which are currently subsidized, with the distribution of the negative welfare effect over household groups dependent on how these subsidies are financed.
2 Zitationen · DOI
A high number of Palestinian workers used to work in Israel for decades. They are mostly employed in low-skilled jobs in Israeli sectors which are highly dependent on foreign labour, namely agriculture and construction. With the beginning of the second Intifada in 2000 border restrictions increased severely due to security concerns, limiting employment possibilities for Palestinians and leaving Palestine with severe unemployment and loss of income. Israeli employers have substituted Palestinian workers with an increasing number of foreign workers, mostly coming from Asia. Growing unemployment among Israeli unskilled workers caused Israel to impose quotas on the employment of foreigners. The purpose of this paper is to estimate the benefits of lifting movement and access restrictions between Israel and the West Bank for both economies. The macro-economic effects of the Israeli labour policy are important to determine the absorptive capacity of the Israeli labour market. Therefore, we use an extended version of the single country CGE model “STAGE” (McDonald, 2009), adapted to a Social Accounting Matrix (SAM) of Israel for the year 2004 (Siddig et al., forthcoming), to simulate the effects of different Israeli labour policy regimes.
Discover Sustainability · 1 Zitationen · DOI
Abstract In most cashew-producing countries, cashew apples, by-products of cashew nut production, remain largely unused despite their nutritional value. Similarly, cashew nut shells, a by-product of nut processing, are often wasted, even though they contain a toxic liquid (cashew nut shell liquid, CNSL) which can pollute the soil but has industrial applications in paint, varnish, and pesticide production. The residual cake left after CNSL extraction can be used to generate bioenergy and biofertilizer. This study analyzes the effects of enhancing the processing of these cashew by-products in Benin using a single-country Computable General Equilibrium model. Based on an empirical study we identify a high potential domestic demand for cashew apple juice indicating a potential to utilize currently wasted cashew apples. A key novelty of our work lies in the extension of the General Equilibrium model to incorporate “unemployed intermediate inputs” (here cashew by-products). Our findings reveal that stimulating demand for cashew apple juice can catalyze growth in the cashew-apple-processing sector and incentivize cashew farming. In addition, targeted subsidies for promoting the cashew-apple-processing sector could further support sectoral development and enhance cashew apple utilization. These developments result in reductions of waste, land use per calorie, trade deficit, and poverty, while increasing domestic value-added, household income, and nutritional security. These findings reflect circular economy principles by showing how waste becomes value, closing loops in the agri-food system. Overall, this study highlights the potential of processing cashew by-products for enhancing the economic, social, and environmental sustainability of the agri-food system.
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Entwicklung eines ökonomischen Modellierungsrahmens zur Unterstützung von Entscheidungsträgern im Wassersektor
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Auswirkungen landwirtschaftlicher Großinvestitionen auf die lokale Ernährungssicherheit: Eine Fallstudie aus Naivasha, Kenia
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Identität, Organisation und Kontakt aus HU-FIS.
- Name
- Dr. Jonas Luckmann
- Titel
- Dr.
- Fakultät
- Lebenswissenschaftliche Fakultät
- Institut
- Albrecht Daniel Thaer-Institut für Agrar- und Gartenbauwissenschaften
- Arbeitsgruppe
- Internationaler Agrarhandel und Entwicklung
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