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101.
Dynamic optimization of crop production with nonuniform irrigation and nitrogen carryover and leaching is considered. A production function system with thresholds, plateau maximum, and yield reduction is estimated from experimental data; rapid convergence to a steady-state is observed. Spatial variability implies a 40% increase in applied water and a six-fold increase in nitrate emissions, while dynamic optimization has more modest impacts. Nitrate emission control is accomplished primarily through reduced applied water, illustrating a strong cross-policy effect. Significant levels of water conservation and nitrate pollution control are achieved at relatively low cost with traditional irrigation systems and baseline conditions. 相似文献
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This paper revisits some recently found evidence in the literature on the cross-section of stock returns for a carefully constructed dataset of euro area stocks. First, we confirm recent results for US data and find evidence of a negative cross-sectional relation between extreme positive returns and average returns after controlling for characteristics such as momentum, book-to-market, size, liquidity and short term return reversal. We argue that this is the case because these stocks have lottery-like characteristics, which is attractive to certain investors. Also, these stocks tend to be very volatile so that arbitrageurs are discouraged from correcting potential mispricing. As a consequence, these stocks are often overpriced and hence face lower expected returns. Second, when we control for extreme returns, the recently found negative relationship between idiosyncratic risk and future returns is less robust. In our models, after adding maximum returns, the relationship is insignificant and sometimes even positive. We also find that idiosyncratic skewness and coskewness play an important role for asset pricing, as predicted by several theoretical models. 相似文献
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From ecological footprint to ecological rent: An economic indicator for resource constraints 总被引:2,自引:0,他引:2
Kurt Kratena 《Ecological Economics》2008,64(3):507-516
This paper takes as a starting point a combination of an input-output model with a national Ecological Footprint account for Germany in the spirit of Wiedmann et al. [Wiedmann, T., Minx, J., Barrett, J., Wackernagel, M., 2006. Allocating ecological footprints to final consumption categories with input-output analysis. Ecological Economics. 56, 28-48]. Footprint as well as Biocapacity is dealt with at the industry level. Gross output of each industry and final demand for each industry can then be split up into a share that is reconcilable with Biocapacity and another share that corresponds to the ‘Ecological Deficit’. The Ecological Footprint concept is extended in this study by introducing the additional biocapacity necessary for sustaining the given level of economic activity. It is assumed that each industry had to rent the corresponding areas and to apply a given technology in order to make this additional land biophysically productive. That results in an additional technology for each industry leading to an increase in costs and prices. The new price level is directly linked to the share of output that corresponds to Biocapacity overshooting, which is defined by the ‘Ecological Deficit’. Economic indicators can be derived by measuring the income difference brought about by the price increase. This difference corresponds to a Ricardian rent which is due to resource constraints on output growth. 相似文献
107.
Kurt Annen 《The Rand journal of economics》2009,40(4):597-610
In many situations, irreconcilable disagreements between players lead to costly ownership disputes over assets—for example, in case of joint ownership. This article studies the role of such disputes in a situation where two players have to make a transaction‐specific investment and when contracts are incomplete. I show that potentially contested ownership may mitigate the inefficiency of investments due to the incompleteness of contracts generating an exchange surplus that comes closer to the first‐best surplus as compared to any other ex ante distribution of ownership typically discussed in the literature following the influential work by Grossman, Hart, and Moore. If the contest is an all‐pay auction, each player makes a transaction‐specific investment as if he or she owns the asset. This article can explain why shared ownership—as for example in equity joint ventures, family firms, start‐up partnerships, and so on—is an important part of today's corporate landscape. 相似文献
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Kurt W. Rothschild 《International Review of Applied Economics》1999,13(2):207-217
The success or failure of macroeconomic policy over time and in comparison to other countries is an important item in political discussions. The present paper discusses the relative advantages and disadvantages of different forms of indices which aim at an aggregated picture for macroeconomic evaluations. Maximising, satisficing, and weights in multi-item indices are discussed on a principal level. In the final section a simple numerical example comparing different countries serves as an illustration of some of the main aspects. It is shown that alternative forms can yield important differences in ranking and offer alternative insights. 相似文献
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The paper discusses the micro foundations of evolutionary economics, introducing a unified concept of the economic agent as a rule maker and rule user. Based on recent findings of the neuronal, cognitive and behavioral sciences, Homo Sapiens Oeconomicus emerges as an alternative to Homo Oeconomicus. A taxonomy of rules distinguishing between cognitive, behavioral and blueprint rules and a set of theoretical propositions related to the structure and evolution of those rules are suggested.JEL Classification:
A 12, B 41, B 52, B 53, D 00, D 64, D 80, D 83, E 11, L20The present paper had its origin in a research project on The Interdisciplinary Foundations of Economic Decision Making supported by the Swiss National Science Foundation during 1978-1980. The core of that work was a brain model whose architecture also serves as a corner stone for this paper. Since then there have been substantial developments in the respective areas; some of the major findings of the more recent research in the neuronal, cognitive and related sciences are discussed and integrated into the present paper. - I gratefully acknowledge insightful comments and criticisms from Georg D. Blind. Some ideas were discussed during my tenure as a Visiting Professor in the Department of Economics at the University of Queensland, in fall 2003, and I wish to record my appreciation of the hospitality during that visit. Particular thanks for the inspiring discussions go to Peter Earl, John Foster, and, as always, Jason Potts. Special thanks are due to Juli Lessmann and Charles R. McCann for their thoughtful corrections of my English prose and their editorial help. The usual disclaimer applies. 相似文献