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651.
  总被引:1,自引:0,他引:1  
This paper presents an alternative approach to the measurement of technical change. It is based on the latent variable level of technology that enters explicitly the input demand system and on a hypothesis about the innovation generating process. By adding measurement error equations, the behavioral system can be viewed as a Multiple Indicators/Multiple Causes (MIMIC) model. The parameter estimates are obtained with a maximum likelihood estimator which involves the implicit covariance matrix. The analysis refers to Italian agriculture and the results provide some evidence on the nature and level of technical change during the years 1961–1991.  相似文献   
652.
    
Natural gas spot prices and temperatures have been studied in detail in the literature as separate processes. We propose a simple joint model that, in spite of its parsimony, describes accurately many stylized facts of the two time series: in particular we show the role played by a time-delay parameter in order to take into account the impact of temperature forecast in cross-dependency. We discuss in detail a stepwise procedure in order to calibrate model parameters, describing the elementary estimation techniques involved and the statistical accuracy achieved. In the analysis, we focus on the benchmark market in the USA (Henry Hub) and the temperatures in the Northeast and Midwest regions; we observe a negative, statistically significant, gas-temperature correlation in the cold season.  相似文献   
653.
Most executives think of decision making as a singular event that occurs at a particular point in time. In reality, though, decision making is a process fraught with power plays, politics, personal nuances, and institutional history. Leaders who recognize this make far better decisions than those who persevere in the fantasy that decisions are events they alone control. That said, some decision-making processes are far more effective than others. Most often, participants use an advocacy process, possibly the least productive way to get things done. They view decision making as a contest, arguing passionately for their preferred solutions, presenting information selectively, withholding relevant conflicting data so they can make a convincing case, and standing firm against opposition. Much more powerful is an inquiry process, in which people consider a variety of options and work together to discover the best solution. Moving from advocacy to inquiry requires careful attention to three critical factors: fostering constructive, rather than personal, conflict; making sure everyone knows that their viewpoints are given serious consideration even if they are not ultimately accepted; and knowing when to bring deliberations to a close. The authors discuss in detail strategies for moving from an advocacy to an inquiry process, as well as for fostering productive conflict, true consideration, and timely closure. And they offer a framework for assessing the effectiveness of your process while you're still in the middle of it. Decision making is a job that lies at the very heart of leadership and one that requires a genius for balance: the ability to embrace the divergence that may characterize early discussions and to forge the unity needed for effective implementation.  相似文献   
654.
The paper questionsthe use of Total Factor Productivity (TFP) measures as a proxyfor the technological level in Italian agriculture. TFP growthreveals a cyclical behaviour and a short-run component due toshocks on both the demand and supply sides. In order to identifyreal long-run technological change, a Kalman filter procedureis applied to a stochastic process depicting the generation oftechnical change induced by R&D and Extension expenditure.The empirical evidence reveals that short-term shocks greatlyaffect the traditional measure of productivity. A better indicatorof technological progress can be obtained by estimating the long-runcomponent of productivity, which seems to be significantly inducedby R&D-Extension public expenditure.  相似文献   
655.
Decisions in Economics and Finance - This paper presents a stylized model of interaction among boundedly rational heterogeneous agents in a multi-asset financial market to examine how agents’...  相似文献   
656.
Switching costs are a key determinant of market performance. This paper tests their existence in the corporate loan market in which they are likely to play a central role because of the complexity of contracts and the relevance of informational problems. Using very detailed data at bank-firm level on four Italian local credit markets we empirically show that firms tend to iterate their choice of the main bank over time. This inertia is not related to unobserved and time invariant firms' preferences across banks and can be attributed to the existence of switching costs. Moreover these costs are higher for single-bank firms. We also offer evidence that banks price discriminate between new and old borrowers by charging lower interest rates to the former in order to cover part of the switching costs. The discount amounts to about 44 basis points and is equal to 7% of the average interest rate. These results prove robust to a number of other potential identification drawbacks.  相似文献   
657.
Abstract This paper emphasizes the role of labour demand as a determinant of human capital formation. After a section in which the alternative conceptions on the functioning of labour markets are presented and different ways of measuring human capital are compared, an applied analysis is carried out in which we provide a labour‐demand‐oriented measure of human capital, as defined by the amount of specific skills firms generate through work‐based training (WBT) activities. By merging three rich firm‐level datasets, we estimate the impact of a set of variables supposed to affect both the propensity to invest in WBT and the intensity of training within the Italian manufacturing industry over the period 2001–2005. Special attention is devoted to the variables characterizing within‐firm organization of knowledge, organizational change and the formation of competence pipelines: among them, innovation, internationalization commitment, out‐sourcing and new hirings. The estimates show that the effect of innovation on WBT is higher when the introduction of new technologies is supported by organizational innovations. When looking at the nature of WBT, we investigate the different determinants of the firms' propensity to provide both in‐house and outside training. We measure training intensity in terms, respectively, of the number of provided training activities, private and total training costs and share of trainees.  相似文献   
658.
[目的]计算云贵高原地区大春马铃薯潜在产量及产量差,分析产生巨大产量差的原因及解决措施。[方法]文章采用由国际马铃薯中心开发的新型植物生长模拟模型Solanum模型与田间试验相结合的方法,更精确地评估马铃薯潜在产量。[结果]云贵高原地区大春马铃薯的产量潜力巨大。云薯401潜在产量为138 t/hm~2,云薯505潜在产量为147 t/hm~2,合作88潜在产量为91.9 t/hm~2,与实际产量之间的产量差(YGM)最大的为云薯505,为117 t/hm~2,与基于FAO农业生态区域法的光温产量潜在模型算法得出的结果相符。与世界范围内已知的马铃薯潜在产量数据相比,云贵高原地区大春马铃薯的潜在产量全球最高。[结论]云贵高原地区大春马铃薯的发展潜力巨大,不同品种的潜在产量存在差异。防控晚疫病,延长生育期以充分利用太阳辐射,提高光合辐射有效利用率(RUE)是提高产量,缩小产量差的关键。  相似文献   
659.
    
ABSTRACT

This paper analyzes the role played by the Brazilian Development Bank (BNDES) in different periods of Brazil’s development process since its founding in 1952. The bank’s history is nonlinear, varying with socio-economic and political changes over time. Four major periods in its history are: (i) from its creation to the debt crisis in the 1980s, a period known as ‘developmentalism’; (ii) the neoliberal movement of the 1990s; (iii) the reintroduction of the BNDES as a relevant tool for development in the 2000s; and (iv) a new neoliberal movement that arose beginning in mid-2016. Each of these periods is characterized by certain development conventions that shape how institutions, such as the BNDES, operate, and at the same time are shaped by them. In contrast to mainstream economics, which focuses on a one-size-fits-all institution for development, this paper evaluates the interactions between development and institutions as historical processes, with an emphasis on the prevailing development conventions. The trajectory and different roles assumed by the BNDES over time exemplify this permanent relationship, rejecting the idea that particular types of institutions are related to development.  相似文献   
660.
We experimentally test how a private monopoly, a duopoly and a public utility allocate water of differing qualities to households and farmers. Most of our results are in line with the theoretical predictions. Overexploitation of the resources is observed independently of the market structure. Stock depletion for the public utility is the fastest, followed by the private duopoly and private monopoly. On the positive aspects of centralized public management, we find that the average quality to price ratio offered by the public monopoly is substantially higher than that offered by the private monopoly or duopoly.  相似文献   
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