On the relationship between hierarchy and type morphisms

Here, we establish a relationship between hierarchy and type morphisms. Both concepts have been used to relate the types in one structure to types in a second “larger” structure. In general, the two concepts may differ, in the sense that a hierarchy morphism need not be a type morphism. We provide a necessary and sufficient condition under which the two concepts coincide. We go on to provide situations under which this condition must be satisfied.     

略论生态经济学与可持续发展经济学的关系

对生态环境的狭义理解，决定了可持续发展经济学与生态经济学是大范畴与小范畴的关系，这种关系决定了它们之间有许多共同的地方，但又存在着许多差别，因此它们之间存在互补的关系，正确处理这种关系，就能促进两者的共同发展。     

On the relationship between population change and sustainable development

This paper investigates the relationship between population growth and economic growth, through the study of fertility choices and their effects on natural resources. It aims at analyzing the interactions between endogenous fertility choices and the environment and their link to the sustainable matter. We analyze a growth model driven by natural resources and without production, where agents have jointly to determine consumption and fertility, taking into account the effects of their decisions on the dynamics of natural resources. We adopt the most optimistic view on natural capital (it generates endogenous growth) and the weakest notion of sustainable paths (all variables are positive): in such a framework we expect that sustainable paths exist. We instead show that this is not always true. In fact, even if renewal capacity of natural resources is unbounded, not always can a sustainable path be found: this depends on the difference between the stationary fertility rate and the mortality rate. If the stationary fertility is lower than the mortality rate, a sustainable path will not be found, and in such a case public intervention is necessary in order to address the economy along a sustainable path. This can simply be done through policies affecting public attention to environmental protection or the intensity of the dilution effect.     

我国出口贸易额与国内生产总值关系研究

以我国1990—2012年的出口贸易额和国内生产总值进行实证分析,并得出结论:我国出口贸易额与国内生产总值成正相关,并且出口贸易总额对国内生产总值的边际系数为0.28。据此,对这种关系提出了一些相关建议。     

The agents of production are the commodities themselves: On the classical theory of production,distribution and value

The paper discusses the classical theory of production, distribution and value as interpreted by Piero Sraffa in his published and unpublished work. The emphasis is on the characteristic features of the theory, including its objectivist orientation; its explanation of all property incomes in terms of the social surplus generated in production conceived of as a circular flow; and its treatment of wages either as paid out of social capital (given inventory wages) or as paid out of the surplus (a given share of wages). The latter concept is traced back to Ricardo's proportional wages.     

Forecasting revisions of German industrial production

Macroeconomic variables, such as industrial production or GDP, are regularly and sometimes substantially revised by the official statistical offices. Nevertheless, there are only few attempts in the previous literature to investigate whether it is possible to forecast these revisions systematically. In this article, it is illustrated how revisions of German industrial production can be forecasted with respect to both the direction and the level of the revision. We are the first to use a large data set for this purpose.     

On the time-varying relationship between EMU sovereign spreads and their determinants

We use a dynamic multipath general-to-specific algorithm to capture structural instability in the link between euro area sovereign bond yield spreads against Germany and their underlying determinants over the period January 1999–August 2011. We offer new evidence suggesting a significant heterogeneity across countries, both in terms of the risk factors determining spreads over time as well as in terms of the magnitude of their impact on spreads. Our findings suggest that the relationship between euro area sovereign risk and the underlying fundamentals is strongly time-varying, turning from inactive to active since the onset of the global financial crisis and further intensifying during the sovereign debt crisis. As a general rule, the set of financial and macro spreads' determinants in the euro area is rather unstable but generally becomes richer and stronger in significance as the crisis evolves.     

On the relationship between the provision of waste management service and illegal dumping

The illegal dumping of waste has been a serious environmental concern of most countries in the world. This paper examines the relationship between the provision of waste treatment facilities and the frequency of illegal dumping. Our results show that a shortage of intermediate waste treatment facilities has played an important role in increasing the frequency of illegal dumping.     

中央银行独立性与通货膨胀关系的实证研究

对中央银行独立性问题的研究起源于对货币政策动态不一致的讨论,学者普遍认为中央银行独立性的增强有助于减轻货币政策动态不一致导致的通货膨胀.本文提出我国的央行独立性应该包括人事独立性、政策独立性和财务独立性三方面,并且用修正过的指标对我国中央银行独立性与通货膨胀之间的关系进行实证分析.在理论上分析了我国中央银行独立性可以抑制通货膨胀的两个机制:固定资产投资渠道和为了缓解收入不平等进行转移支付的渠道.     

The dynamic relationship between the US GDP,imports and domestic production of crude oil

This article investigates the dynamic relationship between crude oil imports, gross domestic product (GDP) and domestic crude oil production of the United States using a Vector Error Correction model estimation, generalized impulse response functions, persistence profile and variance decompositions. This article results suggest that the GDP has a leading role in determining oil imports.     

On optimal control of income generating activities, and the value of flexible production design

The paper provides a closed form solution for the value of a firm which costlessly can change its mode of operation between two activities. The technology is such that production is zero from the inactive production line. In addition we assume that the production potential on any production line is idle when not operated, else the production follows a geometric Brownian motion. Although this framework is rather general, it is motivated by the problem to produce a natural resource located in two separate wells/ores, using a single (flexible) production unit. For what seems to be reasonable parameter values, the flexible unit is seen to achieve a surprisingly large value relative to the value achievable by a comprehensive unit, producing both alternatives simultaneously. In addition it is interesting to note that switching might occur even if the active production line gives the highest immediate income.     

On the relationship between energy returns and trading volume: a multifractal analysis

Forecasting and modelling commodities price movements and the activity of energy markets are of real interest to investors and policymakers, especially during turbulent times. This study investigates the volume–returns relationship for two major energy markets (oil and gas) during the recent global financial crisis. Unlike previous studies, we examine this relationship by applying an original fractal approach to intraday data, which has the advantage of accounting for further non-normality, nonstationarity, and fat-tailedness properties. Our study provides two interesting findings. First, we find a significant multifractal relationship between returns and volume in both markets and across all timescales, suggesting nonlinearity in the cross-correlation between returns and volume and rejecting the efficiency assumption. Second, the measure of multifractality in this relationship shows that the magnitude of the fluctuations during bearish and bullish trends affects the volume–return relationship differently, and that the oil market exhibits higher volatility than does the gas market.     

On moment condition failure in German stock returns: an application of recent advances in extreme value statistics

This note reconsiders divergent results on the extremal behaviour of German stock returns that have been published recently. In particular, investigations of this issue have arrived at different conclusions regarding the finiteness of the second moment of the return distributions. Here we apply some newly developed, improved techniques for the estimation of the so-called tail index to the time series of returns on various German stocks. We find evidence indicating that in the vast majority of cases the tails are not fat enough to conform with an infinite-variance distribution. Conflicting results in previous studies are shown to be due to different a priori choices of the size of the tail region. First version received: Dec. 1998/Final version received: April 2000     

On the simultaneity bias in the relationship between risk attitudes,entry into entrepreneurship and entrepreneurial survival

We consider the simultaneity bias when examining the effect of individual risk attitudes on entrepreneurship. We demonstrate that entry into self-employment is related to changes in risk attitudes. We further show that these changes are correlated with the probability to remain in entrepreneurship.     

Understanding the relationship between poverty and children's health

Throughout the world, children from poor households have worse health than children from wealthier households. There are numerous channels through which such disparities may arise. For designing programs to improve children's health, it is important to identify, for example, whether these disparities arise from differences in pre-natal health inputs and behaviors (nutrition, alcohol and tobacco use during pregnancy), or differential health inputs following birth. We explore these issues for Russia, where children's health is particularly poor. We find that large health disparities between rich and poor originate largely from differences in pre-natal nutrition and alcohol use.     

On the relationship between defense and non-defense spending in the U.S. during the world wars

We show that U.S. defense and non-defense expenditures were positively correlated during World War I and negatively during World War II. We rationalize this pattern in a model with falling spending complementarities and rising marginal tax distortions as government grows.     

Exploring the relationship between technical and service characteristics

The paper explores the complex relationship between technical and service characteristics discussed by the Saviotti–Metcalfe model of innovation. It is proposed that principal components analysis (PCA) is a more appropriate method of analysing this relationship than approaches previously used. A PCA is performed on a dataset of mobile phone handsets for the period 2003 to 2008. In addition to the relationship between technical and service characteristics, the analysis explores the existence of clusters of ergonomic characteristics within mobile phone handsets. The findings indicate that a limited set of core technology components underpin the large set of service characteristics offered by mobile phone handsets, and that the mapping between technical and service characteristics can be highly complex.