Inter-basin water transfers under uncertainty: Storage capacity and optimal guaranteed deliveries

This paper deals with water transfers between jurisdictions not claiming riparian rights to the same water source, and taking place through straightforward sales. Taking into account the uncertain nature of water surpluses, we investigate, within a partial equilibrium framework, the implications of a third party's provision of storing facilities upon the potential supplier's decision whether, and to what extent, it is worthwhile to guarantee a constant amount of water exports. The analysis suggests that there exists a minimum storage capacity below which the potential supplier will never find it profitable to divert a constant amount of water outside his boundaries; the greater the uncertainty about future surpluses and/or internal costs due to even occasional water shortages resulting from the water export commitment, the higher the required minimum storage capacity will be. Above this minimum, an increase in the capacity would be better for the surplus agent, but in a situation in which water surplus is expected to decrease over time, increases in storage capacity would make him willing to guarantee a smaller amount of water deliveries.This work has been carried out under the auspices of the European Science Foundation's research program Sharing fresh water resources in the Mediterranean region: An economic perspective. Previous versions have been presented at ESF workshops held at the Universities of Haifa, Padova and Crete. Financial support from MURST (funds 40% — 1992) is gratefully acknowledged. We wish to thank Nunzio Cappuccio, Haluk Akdogan, Karl Mäler, Mordechai Shechter, Naomi Zeitouni, and two anonimous referees for helpful comments. The usual disclaimer applies.     

Society as a learning system: Discovery,invention, and innovation cycles revisited

The very simple heuristic suggestion that society as a whole and its numerous subsets operate like learning systems, basically governed by Volterra-Lotka equations, has been extremely valuable in organizing a most variegated collection of statistical sets of time series, ranging from the structure of energy markets to the efficiency of machinery and the expansion of empires. In this paper an attempt is made to treat invention and entrepreneurship, generally perceived as the most “free” of human activities but actually subject to iron rules. Invention and innovation during the last 250 years appear in precisely structured waves that lend themselves to robust prediction. The present wave will reach its maximum momentum around 1990. Furthermore, the introduction, maximum market penetrations, and prices of new primary energies show a very strong link to these innovation waves. This stresses once more that economic features may be the expression of deeper “physical” phenomena related to the basic working of society and thus become predictable up to a point through a very abstract and noneconomic analysis.This work has been done in the frame of IIASA's Energy Systems Program and can be considered as an outgrowth of and complement to the research on the evolution of energy systems described in IIASA Research Reports 79-12, 79-13, and 77-22. There it was found that a new primary energy coming into the market must be observed for 10 or 20 years if one is to extract the basic features necessary to predict its long-term market behavior. Specifically, it was concluded that the dates at which new primary energies come into play cannot be predicted. In this paper innovations are considered not one by one but as an abstract set, whose behavior is analyzed. In this frame possible birth dates for new energy sources can be identified, thus enhancing the quality of very long-term forecasting in the energy field. Also, prices appear predictable, at least in their gross features.     

Analyzing online reviews in hospitality: data-driven opportunities for predicting the sharing of negative emotional content

Hospitality is one of the sectors that are nowadays most heavily characterized by consumers’ tendency to share online reviews on dedicated digital platforms. While most past work has focused on understanding the effect of online reviews and ratings on consumers’ evaluation and purchase decisions, this research tackles the issue of what drives the sharing of certain types of online content. Specifically, we investigate the sharing of user-generated content characterized by negative emotional valence, and study the effect of two factors on the extent to which user-generated content contains negative emotions. One such factor is reviewer's expertise, while the other is hotel quality. Our analysis of 1200 TripAdvisor reviews on Italian hotels located in three major Italian cities confirm our hypothesis that expert reviewers might share reviews containing less intense negative emotional content compared to less expert reviewers especially when the hotel is of high quality. To support our hypothesis, we build on the research on psychological antecedents of word-of-mouth behaviour suggesting that expert consumers are particularly reluctant to share negative word-of-mouth to avoid projecting a negative image of themselves in social contexts, thus possibly damaging their reputation.     

Class diversification,economic growth and urban sprawl: evidences from a pre-crisis European city

Economic expansion indirectly promotes class diversification at the neighbourhood scale with a consequent reduction of social divides at the regional scale. To verify this working hypothesis, the present study investigates class diversification at both spatial scales in a Mediterranean city (Athens, Greece) using the European Socioeconomic Classification based on population census data referring to 1991–2001, a phase of economic expansion and intense urban sprawl preceding the 2004 Olympic games. Results of multivariate analysis and diversity indexes outline a local-scale social mix associated to suburban expansion, and regional-scale class segregation, reflecting an increasing polarization in affluent and economically deprived urban districts. The contrasting pattern at the two spatial scales results in a complex social geography with class diversification and moderate changes over time in the economic spatial divide between urban and neighbouring rural areas. These findings contribute to design scale-dependent policies reducing social inequalities and improving quality of life in urban areas. Future paths for socio-spatial processes were delineated for sprawling metropolitan regions under economic expansion and discussed in the light of future demographic trends in both developed and emerging countries.     

On the role of science in the postindustrial society: “Logos”—the empire builder

The hypothesis that language and DNA represent two stages of the same evolutionary path is briefly evaluated. Volterra equations, so useful in describing the dynamics of competing systems are, in fact, equally efficient in describing social behavior, as shown in numerous examples. The emergence of language first, and science later, interpreted as a metalanguage, are attributed to a “hypercyclization” of basic competing utterances in analogy of hypercyclization of quasi-species of replicating molecules in Manfred Eigen's theory of DNA development and evolution.     

Specification tests of asset pricing models using excess returns

In this paper, we discuss the impact of different formulations of asset pricing models on the outcome of specification tests that are performed using excess returns. We point out that the popular way of specifying the stochastic discount factor (SDF) as a linear function of the factors is problematic because (1) the specification test statistic is not invariant to an affine transformation of the factors, and (2) the SDFs of competing models can have very different means. In contrast, an alternative specification that defines the SDF as a linear function of the de-meaned factors is free from these two problems and is more appropriate for model comparison. In addition, we suggest that a modification of the traditional Hansen–Jagannathan distance (HJ-distance) is needed when we use the de-meaned factors. The modified HJ-distance uses the inverse of the covariance matrix (instead of the second moment matrix) of excess returns as the weighting matrix to aggregate pricing errors. Asymptotic distributions of the modified HJ-distance and of the traditional HJ-distance based on the de-meaned SDF under correctly specified and misspecified models are provided. Finally, we propose a simple methodology for computing the standard errors of the estimated SDF parameters that are robust to model misspecification. We show that failure to take model misspecification into account is likely to understate the standard errors of the estimates of the SDF parameters and lead us to erroneously conclude that certain factors are priced.     

Is Ecolabelling a Reliable Environmental Policy Measure?

The rationale of ecolabelling is to enable firms to reap the willingness-to-payfor the environmental attributes of goods by helping consumers toidentify ``green' products. By so doing, ecolabelling is expected tostimulate spontaneous environmental innovation and to reduce aggregatedpollution. Our analysis however outlines situations under whichecolabelling could induce perverse effects, namely increased investment inconventional technologies before the labels are awarded, and examineswhether restricting the issue of labels could constitute an antidote.     

Context Effects on Older Consumers’ Cognitive Age: The Role of Hedonic versus Utilitarian Goals

This paper deals with older consumers’ cognitive age (i.e., the age they feel), which is self‐assessed as systematically lower than their chronological age (i.e., their actual age). Such a tendency would lead older consumers to display attitudes and purchasing behaviors, which are not typical of people of their real age. Two studies show that cognitive age is not an immutable construct but varies according to its context of reference, so that the same individual may feel different ages under different circumstances. Results demonstrate that the declared cognitive age is affected by the physical environment, the social references, and the product categories that the consumer is using when self‐assessing it. Furthermore, the tendency of older consumers to feel younger is stronger when these consumers are pursuing in these contexts hedonic rather than utilitarian goals. These findings provide novel inputs for the development of appropriate ways to measure cognitive age and to deal with it when targeting senior consumers and positioning hedonic versus utilitarian goods.     

Genetic engineering and the energy system: How to make ends meet

The Energy Systems Program at IIASA devotes itself not only to the analysis of new energy systems work, but also to the synthesis of technical methods to solve the problems the analysis brings into evidence. The question of the very high capital investment in solar systems is dealt with, as is the possible problem of reducing this to a level bearable for developing nations.     

Innovation,quality and exports: The case of Italian SMEs

We test the hypothesis that innovating and targeting the upper-quality segment of markets increases Italian small and medium enterprises probability to export, providing empirical evidence that supports it. We observed a positive-quality effect and a strong impact of non-technological innovations over future exports. We also observed that larger and older firms operating in traditional sectors are more likely to export. The most interesting results came from the introduction of interaction terms. We found evidence of a ‘super-additive effects’, which delineate synergic linkages between product innovation activities and quality strategy.