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101.
102.
Summary This paper analyzes the private demand for energy (coal, heating oil, natural gas and electricity) for the period 1958–1974, using yearly data.The energy demand of private households is supposed to be dependent on household incomes, prices of the respective energy sources and yearly temperature levels. The special aim of this paper is to get hold of the influence of the relative prices of the 11 sub-groups of private consumption. The impact of these relativ prices is analyzed through the method of principal components, where upon the first three principal components are introduced as additional independent variables into the regression.Although the principal components do not have any interpretation beyond that of an index, the fit of the estimated demand questions has been improved and the elasticities are more close to the expected values. 相似文献
103.
Camilloni L Farchi S Giorgi Rossi P Chini F Borgia P 《International journal of injury control and safety promotion》2008,15(1):25-31
Home injuries in older people are an important cause of morbidity, disability and death. In addition, the presence of a pre-existing disease has generally been shown to be associated with higher mortality in this population. The objective of the study was to evaluate the association between pre-existing chronic conditions and risk of death among older trauma patients. A retrospective study was conducted in the Lazio Region, including the city of Rome. The study included all the people aged 65 years or older who were admitted to emergency departments in the year 2000 for home or road injuries, which was followed by hospitalisation within 24 hours. Comorbidities are quantified according to the Charlson Comorbidity Index (CCI). The outcome of interest was 30-day mortality. To measure the association between comorbidities and the probability of death, logistic regression was used, adjusting for triage code, sex, age and place of injury. An analysis stratified by triage was also performed. It was found that 17.9% of the injured subjects (8145) were affected by one or more chronic conditions. The probability of death was higher among males, older people, more severe patients and in cases of home accident. Risk of death for non-urgent and urgent patients increased with the increasing of the CCI score. Mortality among very urgent injured elderly was not affected by the presence of chronic conditions. It was concluded that chronic conditions are strong determinants of mortality, particularly for mild injuries. 相似文献
104.
Prof. Dr. Hendrik Schröder Dipl.-Kffr. Gabriele Schettgen 《Marketing Review St. Gallen》2006,23(4):43-47
Die Kombination von Online-Shops, station?ren Gesch?ften und Versandkatalogen versetzt den Einzelh?ndler in die Lage, seine
Kunden an unterschiedlichen Orten zu unterschiedlichen Zeiten zu erreichen. Die Bearbeitung des Marktes mit m?glichst vielen
Kan?len kann der Schlüssel zum Erfolg sein. Wissen die Multi-Channel-Retailer aber tats?chlich, welche Kan?le ihre Kunden
nutzen und welche Kunden welchen Deckungsbeitrag liefern? Kann es sein, dass bestimmte Kunden nur oder überwiegend den elektronischen
Kanal nutzen und mehr Handlungskosten als Rohertr?ge verursachen? Antworten hierauf bietet die kundenbezogene Erfolgsrechnung. 相似文献
105.
We study how two fiat monies, one safe and one risky, compete in a decentralized trading environment. The currencies' equilibrium values, their transaction velocities and agents' spending patterns are endogenously determined. We derive conditions under which agents holding diversified currency portfolios spend the safe currency first and hold the risky one for later purchases. We also examine when the reverse spending pattern is optimal. Traders generally favor dealing in the safe currency, unless trade frictions and the currency risk is low. As risk increases or trading becomes more difficult, the transaction velocity and value of the safe money increases. 相似文献
106.
107.
The paper investigates the changes in job creation and destruction flows at a very disaggregated level of analysis. We analyse whether job flows at lower levels of spatial aggregation display regularities that are in line with national ones in a bid to disentangle the role of labour market institutions. Using a unique database of the population of firms in Trentino (a north‐eastern province of Italy) from 1991 to 2001, we find that: (1) job flows show a ‘fractal’ tendency, i.e. many regularities appear to be scale invariant (magnitude of flow and persistence) and that job flow magnitude is in line with the average values for Italy; (2) there are some qualifications to their ‘fractality’: the contribution of entrant firms to the job creation process is lower than the corresponding contribution at national level, as is the share of job destruction accounted for by exiting firms; and (3) firm size and age influence job flows. 相似文献
108.
This paper presents panel evidence on the productivity effects of middle managers’ off‐the‐job formal training in Italy. It is based on a rich and reliable panel dataset covering all sectors of the Italian economy over the period 2006–2011. We employ panel data techniques and self‐selection models to show that off‐the‐job formal training for middle management has a significant nonlinear exogenous effect on total factor productivity. Moreover, results indicate that middle managers’ off‐the‐job formal training is more effective in larger firms and that different training methods have heterogeneous effects on productivity. 相似文献
109.
In this paper we collect some old and new qualitative-structural properties on the input and output matrices involved in the classical von Neumann model, properties relevant, from the formal and/or economic point of view, in the study of the equilibria of the said model. It is established the hierarchy, i.e. the relations of inclusion, partial overlapping and disjunction, among these properties, which permits to amend some current slips in the analysis of the von Neumann model (one due to von Neumann himself). The results obtained can be fitted to other production and exchange multisectorial models. 相似文献
110.
We relax restrictions on the storage technology in a prototypical monetary search model to study price dispersion. In this case, buyers and sellers enter matches with potentially different willingness to trade. Across the distribution of possible bilateral matches, prices generally will differ even though agents have identical preferences and technologies. We provide existence conditions for a particularly simple equilibrium pattern of exchange. We prove that in the limiting case where search frictions are eliminated, equilibrium prices are uniform. We also show that a higher initial money stock can raise the average price level and increase price dispersion. 相似文献