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排序方式: 共有144条查询结果,搜索用时 15 毫秒
31.
Michael Schneider Jörn Grahl David Francas Daniele Vigo 《International Journal of Production Economics》2013,141(1):56-65
Many present markets for goods and services have highly volatile demand due to short life cycles and strong competition in saturated environments. Determination of capacity levels is difficult because capacities often need to be set long before demand realizes. In order to avoid capacity-demand mismatches, operations managers employ mix-flexible resources which allow them to shift excess demands to unused capacities. The Flexibility Design Problem (FDP) models the decision on the optimal configuration of a flexible (manufacturing) network. FDP is a difficult stochastic optimization problem, for which traditional exact approaches are not able to solve but the smallest instances in reasonable time. We develop a Flexibility Design Genetic Algorithm (FGA) that exploits qualitative insights into the structure of good solutions, such as the well-established chaining principle, to enhance its performance. FGA is compared to a commercial solver, a simple GA, and a Simulated Annealing local search on instances of up to 15 demand types and resources. Experimental evidence shows that the proposed approach outperforms the competing methods with respect to both computing time and solution quality. 相似文献
32.
The Capitalisation of CAP Payments into Land Rental Prices: A Panel Sample Selection Approach
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Gianni Guastella Daniele Moro Paolo Sckokai Mario Veneziani 《Journal of Agricultural Economics》2018,69(3):688-704
The empirical literature suggests that farmland prices and rents capitalise agricultural subsidies and that the 2003 reform of the EU Common Agricultural Policy, which decoupled subsidies from production and attached them to land, may have increased the extent of the phenomenon. Employing a farm‐level dataset, the Farm Accountancy Data Network (FADN) for Italy, we investigate this issue while accounting for selectivity, endogeneity and unobserved individual heterogeneity. To understand the impact of the reform we compare the estimates of capitalisation rate for decoupled payments with those for coupled payments. After correcting for unobserved individual heterogeneity and selectivity, our results reveal no capitalisation of coupled payments and only limited capitalisation of decoupled area payments into farmland rents in Italy. 相似文献
33.
This paper makes use of the distributional information contained in high-frequency data to test for the specification of the functional form of the volatility process within the class of stochastic volatility models. 相似文献
34.
The technological capabilities of nations: The state of the art of synthetic indicators 总被引:1,自引:0,他引:1
Daniele Archibugi Author Vitae Mario Denni Author Vitae Andrea Filippetti Author Vitae 《Technological Forecasting and Social Change》2009,76(7):917-931
Composite synthetic indicators of the technological capabilities of nations have been used more frequently over the last years becoming a sort of Olympic medal table of the innovation race. The European Commission, specialised United Nations Agencies, the World Bank, the World Economic Forum, and individual scholars have developed several of these measurement tools at macroeconomic level. All these indicators are based on a variety of statistical sources in order to capture the multidimensional nature of technological change. This paper reviews these various exercises and: i) it brings into light the explicit and implicit assumptions on the nature of technological change; ii) it discusses their pros and cons; and iii) it explores the consistency among the results achieved. Most of the final rankings at the country level are fairly consistent, but significant discrepancies for some nations emerge. The value of synthetic indicators of technological capabilities for public policy, company strategies and economic studies is finally discussed. 相似文献
35.
Big push or big failure? On the effectiveness of industrialization policies for economic development
Kjetil Bjorvatn Nicola Daniele Coniglio 《Journal of the Japanese and International Economies》2012,26(1):129-141
The role of the government in industrialization is heavily debated. Some claim that extensive government involvement is key to initiate a sustainable development process, others see the government as an obstacle to it, pointing to the importance of government failure. We formulate a model, which explains why even a highly inefficient industrial policy can successfully promote big-push development. Moreover, we show that extensive government intervention is more likely to be successful when the initial level of development is low. 相似文献
36.
Fabrizio Balassone Daniele Franco Stefania Zotteri 《MOCT-MOST: Economic Policy in Transitional Economies》1991,1(1):123-123
Statistical Annex
Hungary 相似文献37.
38.
Daniele Coen-Pirani 《Journal of Monetary Economics》2005,52(2):449-475
This paper studies the effect of margin requirements on asset prices and trading volume in a general equilibrium asset pricing model where Epstein-Zin investors differ in their degree of risk aversion. Under the assumptions of unit intertemporal elasticity of substitution and zero net supply of riskless assets, I show analytically that binding margin requirements do not affect stock prices. This result stands in contrast to previous partial equilibrium analysis where fixed margin requirements increase the volatility of stock prices. In this framework, binding margin requirements induce a fall in the riskless rate, increase its volatility, and increase stock trading volume. 相似文献
39.
Using surveys from the International Social Survey Programme covering the period 1985–2002 for seven European countries (West and East Germany, Sweden, Norway, Italy, the Netherlands and Great Britain), we examine the effect of relative earnings on union membership and show that union density is higher among workers in the intermediate earnings group than among low or high earners. Next, we examine the association of inequality attitudes with union membership and demonstrate that union membership is not only motivated by instrumental considerations related to relative earnings, but also by normative concerns about inequality. We interpret our findings suggesting that rising earnings inequality is in itself a source of union decline. 相似文献
40.
In this work, we analyze the relationship between the patterns of firm diversification, if any, across product lines and across bodies of innovative knowledge, proxied by the patent classes where the firm is present. Putting it more emphatically, we investigate the relationship between “what a firm does” and “what a firm knows.” Using a newly developed dataset matching information on patents and products at the firm level, we provide evidence concerning firms’ technological and product scope, their relationships, the size-scaling and coherence properties of diversification itself. Our analysis shows that typically firms are much more diversified in terms of products than in terms of technologies, with their main products more related to the exploitation of their innovative knowledge. The scaling properties show that the number of products and technologies increases log-linearly with firm size. And the directions of diversification themselves display coherence between neighboring activities also at relatively high degrees of diversification. These findings are well in tune with a capability-based theory of the firm. 相似文献