| 1. |
- Bryngelsson, David, 1981, et al.
(författare)
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A conceptual partial equilibrium model of global agricultural land use
- 2012
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We introduce a conceptual partial equilibrium model of global agricultural land use, based on heterogenous land quality--an area that has received less theoretical attention than location theory. The model is based on maximization of land rent at each parcel through choice of crop and input intensity. Mechanisms of land rent and land-use competition are illustrated in a transparent way, which can be used for e.g. policy testing and for improved understanding of results from larger land-use models. A strength with this approach is that the model to a large extent can be analytically explored. We show how different crops are optimally distributed on land according to their respective area-dependent cost, i.e. costs paid per area regardless of yield. Crops with high such costs are grown on more productive land and crops with low such costs are grown on less productive land, in equilibrium. The equilibrium solution of the model is unique. Further we show how prices are connected between crops that compete for land.
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| 2. |
- Bryngelsson, David, 1981
(författare)
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On Food Price Implications from Expanded Bioenergy Production
- 2012
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Bioenergy has been put forward as a solution to energy security and at the same time to climate change. It is, however, dependent on productive agricultural land, which is a limited resource. Introduction of bioenergy on a large scale will thus compete with food production and natural forests for productive land, a competition expected to affect food prices.In this thesis I focus on poverty nourishment issues related to changing food prices and on the mechanisms of land-use competition and how they affect food prices. In the first paper we use two established indicators for poverty and sensitivity to food-price changes, to capture peoples' vulnerability to rising food-prices, in four Sub-Sahara African countries/regions. In contrast to previous studies, we include all food products instead of just one or a few main staples. We found that the vast majority of people are net consumers of food and that the inclusion of more than main staples increases their net position as consumers and thus vulnerability to high food prices. In paper two and three a conceptual and transparent partial equilibrium model of global land-use competition is developed, analyzed and applied. The model is to a large degree analytically explored and price differentials between crops are derived. The model is subjected to a detailed characterization of its mechanisms and parameters in which parameters that are critical to results and conclusions from the model are detected and their impacts depicted. We conclude that the total amount of productive agricultural area is of crucial importance to the price impacts from large-scale introduction of bioenergy. Yields of bioenergy crops are also important since they determine the amount of land required to produce the bioenergy.
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| 3. |
- Bryngelsson, David, 1981, et al.
(författare)
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The effect of food–price movements on African households
- 2012
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Ingår i: International Journal of Agricultural Resources, Governance and Ecology. - 1741-5004 .- 1462-4605. ; 9:3-4, s. 121-146
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we aim to assess households' vulnerability to food–price increases in four countries in sub–Saharan Africa. We use two established indicators of sensitivity to food price changes - one measuring the share of income spent on food, the other measuring net sales of food compared to total expenditures. In contrast to earlier studies, we look at all food items and not just one or a few staple foods and find that the exclusion of non–staple foods has a significant impact on the results. We find that the shares of the populations spending more than half of their income on food lie in the range 62% to 81% in rural areas and 26% to 67% in urban areas. Further, we find that in all countries/regions studied, most households (74% to 99%) in rural areas are net buyers of food and stand to lose in the short term from higher food prices.
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