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131.
We examine trends in the productivity of the pharmaceutical sector over the past three decades. Motivated by Ricardo's insight that productivity and rents are endogenous to demand when inputs are scarce, we examine the industry's aggregate Research and Development (R&D) production function. Using exogenous demand shocks to instrument investments, we find that demand growth can explain a large portion of R&D growth. Returns to scale have been stable, whereas total factor productivity has declined significantly. Predicted rents based on our estimates and Ricardo's theory closely match the trends we observe. 相似文献
132.
Christoph Schmitz Hans van Meijl Page Kyle Gerald C. Nelson Shinichiro Fujimori Angelo Gurgel Petr Havlik Edwina Heyhoe Daniel Mason d'Croz Alexander Popp Ron Sands Andrzej Tabeau Dominique van der Mensbrugghe Martin von Lampe Marshall Wise Elodie Blanc Tomoko Hasegawa Aikaterini Kavallari Hugo Valin 《Agricultural Economics》2014,45(1):69-84
Changes in agricultural land use have important implications for environmental services. Previous studies of agricultural land‐use futures have been published indicating large uncertainty due to different model assumptions and methodologies. In this article we present a first comprehensive comparison of global agro‐economic models that have harmonized drivers of population, GDP, and biophysical yields. The comparison allows us to ask two research questions: (1) How much cropland will be used under different socioeconomic and climate change scenarios? (2) How can differences in model results be explained? The comparison includes four partial and six general equilibrium models that differ in how they model land supply and amount of potentially available land. We analyze results of two different socioeconomic scenarios and three climate scenarios (one with constant climate). Most models (7 out of 10) project an increase of cropland of 10–25% by 2050 compared to 2005 (under constant climate), but one model projects a decrease. Pasture land expands in some models, which increase the treat on natural vegetation further. Across all models most of the cropland expansion takes place in South America and sub‐Saharan Africa. In general, the strongest differences in model results are related to differences in the costs of land expansion, the endogenous productivity responses, and the assumptions about potential cropland. 相似文献
133.
Hermann Lotze‐Campen Martin von Lampe Page Kyle Shinichiro Fujimori Petr Havlik Hans van Meijl Tomoko Hasegawa Alexander Popp Christoph Schmitz Andrzej Tabeau Hugo Valin Dirk Willenbockel Marshall Wise 《Agricultural Economics》2014,45(1):103-116
Integrated Assessment studies have shown that meeting ambitious greenhouse gas mitigation targets will require substantial amounts of bioenergy as part of the future energy mix. In the course of the Agricultural Model Intercomparison and Improvement Project (AgMIP), five global agro‐economic models were used to analyze a future scenario with global demand for ligno‐cellulosic bioenergy rising to about 100 ExaJoule in 2050. From this exercise a tentative conclusion can be drawn that ambitious climate change mitigation need not drive up global food prices much, if the extra land required for bioenergy production is accessible or if the feedstock, for example, from forests, does not directly compete for agricultural land. Agricultural price effects across models by the year 2050 from high bioenergy demand in an ambitious mitigation scenario appear to be much smaller (+5% average across models) than from direct climate impacts on crop yields in a high‐emission scenario (+25% average across models). However, potential future scarcities of water and nutrients, policy‐induced restrictions on agricultural land expansion, as well as potential welfare losses have not been specifically looked at in this exercise. 相似文献
134.
Kyle T. Mays 《International journal of urban and regional research》2023,47(1):155-162
The connection between Indigeneity and urban spaces remains on the margins of urban studies and Indigenous studies, even as the majority of Indigenous people in the United States live in cities. Scholars have recently begun to think about the connection between settler colonialism and racial capitalism and the urban. In this essay I examine how the dispossession of Indigenous peoples has shaped modern urban development and, importantly, how Indigenous peoples and culture have contributed to reclaiming and challenging urban dispossession through their engagement with Black people and culture. In this essay I use a few examples of Indigenous expressive culture in Detroit, Michigan, during the Emergency Management Era and urban Indigenous youth activism, to urge for us to move beyond simply demonstrating that Indigenous peoples live in urban contexts. Instead, I call for an urban Indigenous studies that explores the connections between dispossession and the possibilities of a radical Indigenous resurgence in cities, and describe how this can be done through solidarity with African Americans in a predominantly Black city. 相似文献
135.
Through this article I contribute to debates about planetary urbanization by specifying how imperialism, defined as states restricting the self-determination of other states or peoples, intersects with urbanization. While recent urban theory has explored how urbanization unfolds at scales beyond the city and in relation to global capital accumulation, it has not fully extended these insights to incorporate the central role of states and imperialism. First, I argue that doing so develops a more expansive account of extended urbanization by revealing how networks of military bases are themselves enmeshed in the production of urban networks via state policies, and that militarized sites safeguard the global capitalist economy that sustains urbanization. Secondly, I argue that imperialism changes concentrated urbanization by restricting self-determination, fomenting spatial formations that prioritize militarism, and shifting urban politics to a larger scale. I show these dynamics through a historical analysis of the US military's strategic interest in the island of Guåhan/Guam at the end of the second world war, and then generalize from this case to consider variegated outcomes at the intersections of urbanization and imperialism. In the article I aim to more adequately explain the heterogenous ways urbanization unfolds across the contemporary world. 相似文献
136.
Indigenous urbanism is an analytic and vital experience that captures everyday life and extreme moments of conflict in settler colonies. While highly localized, Indigenous urbanism/s are comparable across time and space. Delivered from different parts of the world, the essays in this collection highlight that Indigenous urbanism is politically, socially and culturally significant not only for Indigenous peoples in cities, but also for urban settlers and non-Indigenous people of color. While Indigenous urbanisms are foregrounded by settler-colonial structures and processes, they also underscore the unresolved nature of social relations in cities, and indeed, the unsettled character of the city itself. This introduction briefly sketches the themes and scope of each essay and draws them into conversation. Taken together, this collection illustrates the relational—rather than reactionary—character of Indigenous urbanisms as structure, in and of the (settler) city. Indigenous urbanisms shape cities by engaging with broader categories of human relations, intimate connections, conflict and resistance. 相似文献