共查询到20条相似文献,搜索用时 31 毫秒
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A note on longevity enhancing investment 总被引:1,自引:0,他引:1
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Christopher L. Magee Tessaleno C. DevezasAuthor vitae 《Technological Forecasting and Social Change》2011,78(8):1365-1378
This paper reviews a large number of approaches that have been used for considering technologically driven profound societal change. We agree with Vinge's suggestion for naming events that are “capable of rupturing the fabric of human history” (or leading to profound societal changes) as a “singularity”. This is a useful terminology especially since a mathematically rigorous singularity seems impossible for technological and related societal change. The overview of previous work is done within the context of a broader look at the role of technological change within human history. The review shows that a wide variety of methods have been used and almost all point to singularities in the present century particularly in the middle of the century. The diversity of the methods is reassuring about the potential robustness of these predictions. However, the subjectivity of labeling events as singularities (even well studied past events) is a concern about all of the methods and thus one must carefully pause when relying in any way on these predictions. The general lack of empirical research in this area is also a concern.Quantitative considerations (by proponents and opponents) about past singularities or future singularities often confound two types of metrics. The first type is essentially related to diffusion of technologies (or bundles of technologies) where the logistic curve is empirically well established as the proper time dependence. The second type of metric is for technological capability where hyper-exponentials are empirically well established for their time dependence. In this paper, we consider two past singularities (arguably with important enough social change to qualify) in which the basic metric is alternatively of one type or another. The globalization occurring under Portuguese leadership of maritime empire building and naval technological progress is characterized by a metric describing diffusion. The revolution in time keeping, on the other hand, is characterized by a technological capability metric. For these two cases (and thus robust to the choice of metric type), we find that:
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People undergoing profound technologically-driven societal change do not sense a singularity. •
The societal impacts depend in complicated ways on human needs, institutional variables and other more uncertain factors and thus are particularly hard to project; •
The societal impact is apparently not determined by the rate of progress on either type of metric or by projections to mathematical points with either kind of metric. This finding supports the existing concept that social change due to technology is a more holistic phenomenon than can be characterized by any technical metric.
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The work feasible portfolio is built into the work, that is, the k-dimensional Q column vector with components qi where qi 0 for i=1,...,k and q1+...+qk=1. We define i=1,...,k in the following way:
, where:
. It is indicated that if ri<rj, then qi<qj and, moreover, the qi=tib
i
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relation occurs between qi and bi estimators of parameters of characteristic line:
, where ti is a certain constant. The effective formulas for a profit rate and risk of the constructed feasible portfolio are given. 相似文献
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This study examines the impact of a stamp tax rate increase on market behavior, using data from two stock exchanges in China. We find that when the tax rate increases from 0.3 to 0.5% (which implies that the transaction cost increases by about 1/3) trading volume decreases by 1/3. This implies an elasticity of turnover with respect to a stamp tax of −50% and an elasticity of turnover with respect to transaction cost of −100%. The markets’ volatility significantly increases after the increase in the tax rate. Furthermore, the change in the volatility structure indicates that the markets become less efficient in the sense that shocks are less quickly assimilated in the markets.
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Badi H. Baltagi (Corresponding author)Email: |
Dong LiEmail: |
Qi LiEmail: |
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Sourushe Zandvakili 《Forum for Social Economics》2008,37(2):135-145
Assessment of inequality measurement is the focus for this survey. All measures of inequality must be evaluated based on a
set of desirable properties. More importantly, the usefulness of statistical inference for measures of inequality needs examination.
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Sourushe ZandvakiliEmail: |
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How large is liquidity risk in an automated auction market? 总被引:2,自引:0,他引:2
We introduce a new empirical methodology that models liquidity risk over short time periods for impatient traders who submit market orders. Using Value-at-Risk type measures, we quantify the liquidity risk premia for portfolios and individual stocks traded on the automated auction market Xetra. The specificity of our approach relies on the adequate econometric modelling of the potential price impact incurred by the liquidation of a portfolio. We study the sensitivity of liquidity risk towards portfolio size and traders' time horizon, and interpret its diurnal variation in the light of market microstructure theory.
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Pierre GiotEmail: Phone: +32-81-724887 |
Joachim Grammig (Corresponding author)Email: Phone: +49-7071-2976009Fax: +49-29-5546 |
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Thierry Aimar 《The Review of Austrian Economics》2009,22(3):199-207
The Austrian School has had a curious destiny: while contributing many concepts to contemporary economic theory, it is either
ignored or criticised by much of modern economic literature. This article discusses possible reasons for this institutional
sidelining and the main futures of a renewal of Austrian thought.
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Thierry AimarEmail: |
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It is well-known that endogenous cycles can occur in Ramsey models with heterogeneous households and borrowing constraints.
In this note, we address the issue of robustness in the more general case of endogenous labor supply and we explain the occurrence
of local indeterminacy under progressive taxation.
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Thomas Seegmuller (Corresponding author)Email: |
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The authors welcome criticisms emanating from neoclassical critics of Austrian economics. We congratulate Laidler for transcending
the usual modes of macroeconomic analysis to take on praxeological considerations. This paper should be interpreted as a welcome
for his efforts in the hope that they will be widely emulated within the profession.
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William Barnett IIEmail: |
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Corrado Andini 《Portuguese Economic Journal》2009,8(1):15-22
In a seminal paper, Levine et al. (J Monet Econ 46:31–77, 2000) provide cross-sectional evidence showing that financial development has positive average impact on long-run growth, using
a sample of 71 countries. We argue that the evidence is sensitive to the presence of outliers.
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Corrado AndiniEmail: |
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Gianandrea Goisis Maria Letizia Giorgetti Paola Parravicini Francesco Salsano Giovanna Tagliabue 《International Review of Economics》2009,56(3):227-242
In this article, using the data of 2008, we try to describe the impact of scale and product differentiation in 282 European
banks. While evidence of the economies of scale is less clear, the results obtained using a translogarithmic function system
show that significant economies of scope do exist even for new banking products like derivatives.
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Giovanna TagliabueEmail: |
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Jianpei Li 《Portuguese Economic Journal》2009,8(2):119-136
This paper analyzes the efficiency of team production when risk-neutral agents exhibit other-regarding preferences. It is
shown that full efficiency can be sustained as an equilibrium of a budget-balancing mechanism that punishes some randomly
chosen agents if output falls short of the efficient level but distributes output equally otherwise. The result depends on
agents being sufficiently inequity-averse.
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Jianpei LiEmail: |
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Robert D. Tollison 《The Review of Austrian Economics》2009,22(2):127-130
Besley’s treatment of principled agents is a major contribution to public choice and political economy. By focusing on politics
as an agency problem, he has shown the way to a new generation of research on the interface of politics and economics.
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Robert D. TollisonEmail: |
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Diego Comin 《Empirica》2009,36(2):165-176
This paper discusses several approaches to generating the observed persistence in macro models and presents evidence in favor
of models where endogenous technology adoption propagates transitory shocks into the medium term.
Prepared for the Conference on “The Interrelation of Cycles and Growth” in honor of Gunther Tichy.
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Diego CominEmail: |
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The paper investigates the social exclusion process in the European Union (EU), particularly in Luxemburg, addressing both
conceptual and empirical issues. It examines aspects such as: the most appropriate definition of social exclusion for the
case of Luxemburg, the way economic and social disadvantages cumulate within the social exclusion process, and the main determinants
of social exclusion, income poverty and deprivation. To analyze the topics mentioned above, different econometric models have
been applied.
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Ileana TacheEmail: |
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Philipp Engler Terhi Jokipii Christian Merkl Pablo Rovira Kaltwasser Lúcio Vinhas de Souza 《Empirica》2007,34(5):411-425
This paper analyzes the role of banks’ regulatory capitalization in the transmission of monetary policy. We use a confidential
dataset for Austrian banks spanning from the first quarter of 1997 to the fourth quarter of 2003. We find evidence that Austrian
banks react in an asymmetric way to monetary policy depending on their regulatory excess capitalization, i.e. low capitalized
banks react more restrictively to a monetary tightening than their highly capitalized peers.
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Lúcio Vinhas de SouzaEmail: |
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Thierry Aimar 《The Review of Austrian Economics》2008,21(1):23-43
This article argues for an extension of the Austrian paradigm of the ignorance of actors. The idea that will be defended here
is that actors are not only confronted with their lack of knowledge of the other person but also with their lack of self-knowledge.
From this perspective, the article seeks to understand the implications of this phenomenon in terms of infra-individual coordination
and to account for the mental processes mobilized by the individual mind so as to deal with that self-ignorance.
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Thierry AimarEmail: |