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| Registros recuperados: 16 | |
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| Hallman, Kelly K.; Lewis, David J.; Begum, Suraiya. |
| This study examines the poverty reduction implications of the introduction of three different agricultural technologies by government and NGOs in three rural sites across Bangladesh. The first is new vegetable seeds developed by AVRDC introduced in Saturia to women owning small amounts of land by a local NGO, based on a training and credit dissemination approach. The second is polyculture fish technology developed by WorldFish Center and introduced by a government extension program based on private fishponds operated mostly by men in Mymensingh. The third is the same polyculture fish technology, but introduced through a local NGO in Jessore based on the arrangement of leased fishponds operated by groups of low income women, supported by training and credit... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2003 |
URL: http://purl.umn.edu/16073 |
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| Horsch, Eric J.; Lewis, David J.. |
| The invasion of ecosystems by non-native species is widely considered to be a principal threat to global biological diversity, yet the social costs of invasive species are not well-understood. The purpose of this study is to estimate a hedonic model of lakeshore property values to quantify the effects of a common aquatic invasive species – Eurasian Watermilfoil – on property values across an extensive system of over 170 lakes in the northern forest region of Wisconsin. In addition to providing empirical evidence as to the potential benefits from reducing the spread of invasive species, this paper also develops a quasi-experimental methodology to identify the effects of changes in endogenous neighborhood amenities within the commonly estimated hedonic... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Land Economics/Use; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/6199 |
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| Lewis, David J.; Plantinga, Andrew J.. |
| Forest fragmentation is a primary threat to terrestrial biodiversity. We combine a parcel-level econometric model of land-use transitions with spatially-explicit landscape simulations to predict the empirical distribution of fragmentation outcomes under given market conditions and policy scenarios. Our model explains transitions between forest, agricultural, and urban uses, allowing us to model land use change in both rural and urban areas. A Monte Carlo simulation approach links econometrically-derived transition probabilities to GIS maps for the prediction of the spatial properties of habitat change. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/19910 |
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| Horsch, Eric J.; Lewis, David J.. |
| This study uses hedonic analysis to estimate the effects of a common aquatic invasive species – Eurasian Watermilfoil (milfoil) – on property values across an extensive system of over 170 lakes in the northern forest region of Wisconsin. Since milfoil is inadvertently spread by recreational boaters, and since boaters are more likely to visit attractive lakes, variables indicating the presence of milfoil are endogenous in a hedonic model. Using an identification strategy based on a spatial difference-in-differences specification, results indicate that lakes invaded with milfoil experienced an average 13% decrease in land values after invasion. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/92216 |
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| Lewis, David J.; Provencher, Bill. |
| This paper examines the effects of environmental zoning policies on lakefront land development, sorting, and economic welfare in a model where agents are heterogeneous in preferences and income. Agents consume lakefront amenities that are endogenous to development and the sorting process yields lakes which differ by amenities and frontage prices. Our findings include the following: i) lakes become more homogeneous with a collapsing price premium as incomes grow, ii) zoning can preserve the sorting process and be welfare improving, and iii) land prices may not capture all welfare effects from zoning. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/10283 |
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| Lewis, David J.; Barham, Bradford L.; Zimmerer, Karl S.. |
| Spatial externalities can affect economic welfare and landscape pattern by linking farm returns on adjoining parcels of land. While policy can be informed by research that documents spatial externalities, statistically quantifying the presence of externalities from landscape pattern is insufficient for policy guidance unless the underlying cause of the externality can be identified as positive or negative. This article provides a springboard for empirical research by examining the underlying structure, social-environmental interactions, and statistical identification strategies for the analysis and quantification of agricultural spatial externalities that are derived from observations of landscape change. The potential for original policy treatments of... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2007 |
URL: http://purl.umn.edu/92151 |
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| Hossain, Mahabub; Lewis, David J.; Bose, Manik Lal; Chowdhury, Alamgir. |
| This case study builds on an ongoing large-scale quantitative research project undertaken by BIDS/IRRI since 1987 originally in 64 unions from 57 districts of the country. It adds a qualitative research component to examine the impact of modern rice varieties (MVs) on livelihoods in a structured sample of eight of these villages across a range of favorable and unfavorable contexts. This component was structured using the sustainable livelihoods framework and employed focus groups stratified by poverty ranking and gender. Rice is grown over almost 75 percent of the land area and is the country's most important crop. Two-thirds of this land area is now covered by MV technology after a rapid expansion over the past 15 years. The adoption process has been... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/16082 |
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| Lewis, David J.; Plantinga, Andrew J.; Wu, JunJie. |
| This paper develops a theoretical model to analyze the spatial targeting of incentives for the restoration of forested landscapes when wildlife habitat can be enhanced by reducing fragmentation. The key theoretical result is that the marginal net benefits of increasing forest are convex, indicating that corner solutions – converting either none or all of the agricultural land in a section to forest – may be optimal. Corner solutions are directly linked to the spatial process determining habitat benefits and the regulator’s incomplete information regarding landowner opportunity costs. We present findings from a large-scale empirical landscape simulation that supports our key theoretical results. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/92217 |
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| Lewis, David J.; Plantinga, Andrew J.; Nelson, Erik; Polasky, Stephen. |
| In this paper we analyze the efficiency of voluntary incentive-based land-use policies for biodiversity conservation. Two factors combine to make it difficult to achieve an efficient result. First, the spatial pattern of habitat across multiple landowners is important for determining biodiversity conservation results. Second, the willingness of private landowners to accept a payment in exchange for enrolling in a conservation program is private information. Therefore, a conservation agency cannot easily control the spatial pattern of voluntary enrollment in conservation programs. We begin by showing how the distribution of a landowner’s willingness to accept a conservation payment can be derived from a parcel-scale land-use change model. Next we combine... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2009 |
URL: http://purl.umn.edu/92220 |
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| Lewis, David J.. |
| This paper develops a joint econometric-simulation framework to forecast detailed empirical distributions of the spatial pattern of land-use and ecosystem change. In-sample and out-of-sample forecasting tests are used to examine the performance of the parcel-scale econometric and simulation models, and the importance of multiple forecasting challenges is assessed. The econometric-simulation method is integrated with an ecological model to generate forecasts of the probability of localized extinctions of an amphibian species. The paper demonstrates the potential of integrating economic and ecological models to generate ecological forecasts in the presence of alternative market conditions and land-use policy constraints. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods. |
| Ano: 2009 |
URL: http://purl.umn.edu/92218 |
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| Lewis, David J.; Wu, JunJie. |
| Habitat fragmentation is widely considered a primary threat to biodiversity. This paper develops a theoretical model of land use to analyze the optimal conservation of landscapes when land quality is spatially heterogeneous and wildlife habitat is fragmented and socially valuable. When agriculture is the primary cause of fragmentation, we show that reforestation efforts should be targeted to the most fragmented landscapes with an aggregate share of forest equal to a threshold, defined by the ratio of the opportunity cost of conversion to the social value of core forest. When urban development is the primary cause of fragmentation, we show how spatial heterogeneity in amenities and household neighbor preferences affect the optimal landscape and the design... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Land Economics/Use. |
| Ano: 2005 |
URL: http://purl.umn.edu/19425 |
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| Provencher, Bill; Lewis, David J.; Schoen, Joe. |
| In this paper we present a preliminary analysis of whether and how spatial variation in environmental attributes affects the residential sorting of households with heterogeneous preferences. An important implication of such sorting arises if variation in preferences over environmental attributes is correlated with household activities affecting the local ecosystem, such as the replacement of native vegetation with lawns, and the removal of course woody habitat from a lake. In this case the sorting process may engender differential evolution of local ecosystems (lakes) with the same initial ecological state. The model examined in the paper has the potential to statistically examine this issue, and therefore holds promise for understanding the behavioral... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2007 |
URL: http://purl.umn.edu/9794 |
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| Lewis, David J.; Provencher, Bill; Butsic, Van. |
| Recent economic analyses emphasize that designated open-space increases the rents on neighboring residential land, and likewise, the probability of undeveloped land converting to residential uses. This paper addresses a different question: What is the effect of local open space conservation on the rate of growth in the density of existing residential land? The analysis is relevant for exurban development and also for remote lakeshore development, where shoreline development density can rapidly increase over time and open-space policies are often advocated as a way to protect ecosystems by reducing development. A discrete choice econometric model of lakeshore development is estimated with a unique parcel-level spatial-temporal dataset, using maximum... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2008 |
URL: http://purl.umn.edu/92199 |
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| Registros recuperados: 16 | |
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