Network planning of fuelling service stations in a near-term competitive scenario of the hydrogen economy

Hydrogen can be viewed as the flexible automotive fuel of the future. However, many issues related to its use have not been sufficiently investigated. One such issue concerns hydrogen logistics and distribution throughout a territory. One near-term scenario over the next decade is likely to include distribution procedures that are similar to those currently used for petrol products. In this scenario, the conversion of petrol service stations into hydrogen distribution points will progressively be implemented. Petrol companies will then represent one of the major categories of hydrogen producers. They will thus have to select, from a cost/benefit standpoint that accounts for competing companies expected to offer the same service throughout a territory, the most convenient and effective locations for hydrogen distribution. The current paper presents a model for planning a network of service stations of a given company within a competitive framework. A case study of a specific territory in northern Italy is presented and discussed.     

General competitive equilibrium of the spatial economy : Two Teasers

The local indivisibility of space complicates general equilibrium analysis. Mazzoleni and Montesano (1984, p. 286), suggest that the usual reasoning of the non-spatial analyses of competitive equilibrium can be performed in the context of a commodity space that contains subsets of land. This space, however, lacks a linear structure, so it resists application of the usual reasoning. Two examples will show that Mazzoleni and Montesano's existence results are flawed.     

城市经济发展中特色经济与集群经济的关系--兼论城市园区经济建设

特色经济与集群经济现在是城市经济发展过程中两个彰显的概念,二者从不同角度阐释了城市经济发展的基本要求.特色经济反映的是城市经济的质,而集群经济反映的是城市经济的量.没有特色的城市经济缺乏活力和竞争力,没有集群的特色经济则对城市经济的带动作用就微乎其微.二者的有机统一才是最具活力和竞争力的城市经济单元.     

谈市场经济条件下的企业理财观念

观念的转变具有时间的滞后性 ,因此需要就企业界尚存的传统理财观念进行反思与剖析 ,并按照市场经济规律的内在要求 ,提出与国际惯例接轨的全新理财观念     

Core and competitive equilibria of a coalitional exchange economy with infinite time horizon

The core and competitive equilibria of a large exchange economy on the commodity space ?^∞${?}^{\infty }$ will be discussed. We define the economy as a measure on the space of consumers’ characteristics following Hart and Kohlberg (1974), and prove the existence of competitive equilibria and their equivalence with the core without assuming the convexity of preferences.     

An existence theorem for Cournot–Walras equilibria in a monopolistically competitive economy

We establish an existence theorem for Cournot–Walras equilibria in a monopolistically competitive economy. Instead of the traditional approach which depends on Kakutani’s fixed point theorem, we employ the theories of aggregative games and best reply potential games. We show that, if there exists a representative consumer, under some conditions on preferences and production technologies, the profit maximization game is a (pseudo) best reply potential game. Hence, the existence of the equilibria is proved independently of the well known convex-valued assumption on the best responses. Although our assumptions result in the additive separability on a utility function of a representative consumer, the existence of increasing returns and indivisible productions can be allowed. In our model, it is shown that the game played by firms exhibits strategic substitutes whether the products of firms are substitutes or complements, and this plays an important role for the existence of the equilibria.     

On the role of government in a stochastically growing open economy

The relationship between the size of government, economic growth, and volatility in a small open economy is analyzed. First, we characterize the stochastic equilibrium for a centrally planned economy, contrasting it with a closed economy. The role of government consumption expenditure both as a stabilizing and a destabilizing factor is discussed. The optimal size of government is derived and we find that an open economy will have a larger government if and only if it is a net creditor. Second, the stochastic equilibrium in a decentralized economy is characterized and the optimal tax structure derived. Finally, the role of government production expenditure and its impact on risk is briefly discussed.     

The existence of rational expectations equilibria in a large economy with noisy price observations

Non-revealing rational expectations equilibria exist in microeconomic pure exchange economies in which a continuum of uninformed agents have suitably distributed noisy price observations. Slight dispersion in the prices observed by the subset of uninformed consumers is the key condition for continuity (and smoothness) of aggregate excess demand, although individual demands are discontinuous. It leads to equilibria in which markets approximately clear in a strong sense. The equilibria are obtained by applying a fixed point argument to state-dependent excess demand functions.     

On the probability of entry in potential competition cases

This paper explores, both theoretically and empirically, the extent to which having ‘other potential entrants’ to a market injected into potential-competition cases has been a worthwhile enterprise. This two-pronged attack leads to the conclusion that (he attempt to specifically identify potential entrants probably results in our deluding ourselves as to the likelihood that entry will occur, and that unless a convincing argument can be made to the effect that any given potential entrant from a stockpile of unnamed potential entrants is ‘reasonably likely’ to elect the entry option, expanding lhat stockpile will be similarly misleading.     

On probability models in voting theory

This paper illustrates the use of probability models to study properties of voting rules. In particular, a simple occupancy distribution and its limiting Dlrichlet form are introduced, corresponding to simplifying assumptions about voters' preferences. We use as illustrations the occurrence probability of the Condorcet Paradox, a vintage problem in social choice theory, along with the related concept of Condorcet efficiency, a measure of goodness for voting rules. Further examples include properties of a lottery rule and the vulnerability of certain voting rules to strategic manipulation. Prospects for future work are indicated.     

On the positive correlation property in competitive insurance markets

Most competitive models of insurance markets under asymmetric information predict a positive relationship between coverage and the accident probability. This paper derives the conditions under which this prediction holds true in a general setting involving multiple loss levels and fixed administrative costs. If there is one loss level, this prediction holds necessarily true only if all equilibrium contracts offer strictly positive coverage. With multiple loss levels, the positive relationship between coverage and the accident probability may not hold true even if all contracts offer strictly positive coverage and administrative costs are zero. These results have important implications for empirical testing.     

城市经济的保障体系

提出了城市经济保障体系的概念 ,认为经济保障体系是指城市政府为保证城市内部各项经济活动的顺利进行而实施的一系列保护措施、制度、法规等。指出城市政府应不断完善经济保障体系 ,以减少城市内部的各行其是与无序竞争 ,降低城市经济的运作成本 ,提高城市的经济效益     

Changing industrial structure and competitive patterns of manufacturing and non-manufacturing in a small open economy: An entropy measurement

This paper studies the industrial concentration and competitive patterns of Hong Kong, a typical small open economy, via an entropy measurement. A relatively low degree of concentration was found to exist. Manufacturing showed decreasing concentration for 1976-81 and increasing concentration after 1987. Non-manufacturing had decreasing concentration since 1982. A structural change between the sectors had occurred. The size of the domestic market seemed unimportant in determining the level of concentration in a small open economy with free trade. The open-door policy of the PRC which facilitated free resource mobility and outward investment between the two regions should be important to contribute such patterns.     

On the political economy of urbanization in the Third World

Cette analyse de l'urbanisation d'aprés-guerre en Afrique Occidentale est proposée comme un jalon pour l'économie politique de l'urbanisation dans le Tiers Monde. L'Afrique Occidentale est une des régions les moins urbanisées du monde qui cependant a récemment connu une urbanisation plus rapide que toute autre. Cette explosion urbaine est associée avec des inégalités sévères à trois niveaux:

• 1 un déséquilibre profond dans les conditions de travail et de vie entre le secteur urbain et le secteur rural
• 2 une forte concentration des ressources dans les capitales
• 3 une énorme disparité économique à l'intérieur des villes entre les masses et une petit élite

Si l'urbanisation en Afrique Occidentale est caractérisée par ces inégalités, il apparait qu'elle entraîne aussi des pertes économiques. Deux approches suggèrent que l'allocation des ressources est loin d'ětre optimale pour la croissance économique. D'une part des ressources sont gaspillées dans le chǒmage et le sous-emploi urbain, dans la croissance des grands centres métropolitains, et dans la construction des ‘quartiers spontanés’. D'autre part la présupposition que la forme prise par l'urbanisation est le résultat d'une allocation optimale des ressources est mise en doute quand les facteurs qui affectent les paramètres économiques ou qui interferent directement avec les décisions d'investissement sont soumis à l'examen, et quand l'attention est dirigée sur le processus politique qui s'avère constamment dominé par les intérěts et les préoccupations d'un petit groupe de dirigeants.