scholarly journals Skewed Wealth Distributions: Theory and Empirics

2018 ◽  
Vol 56 (4) ◽  
pp. 1261-1291 ◽  
Author(s):  
Jess Benhabib ◽  
Alberto Bisin
Keyword(s):  
Cross Section ◽  
Wealth Distribution ◽  
Empirical Work ◽  
Theoretical Studies ◽  
Rational Agents ◽  
Distribution Of Wealth ◽  
Time Periods ◽  
Economic Mechanisms ◽  
The Right ◽  
Thick Tails

Invariably, across a cross-section of countries and time periods, wealth distributions are skewed to the right displaying thick upper tails, that is, large and slowly declining top wealth shares. In this survey, we categorize the theoretical studies on the distribution of wealth in terms of the underlying economic mechanisms generating skewness and thick tails. Further, we show how these mechanisms can be micro-founded by the consumption–savings decisions of rational agents in specific economic and demographic environments. Finally we map the large empirical work on the wealth distribution to its theoretical underpinnings. (JEL C46, D14, D31, E21, J31)

Longitudinal oscillation of a rod with a variable cross section

2019 ◽  
Vol 14 (2) ◽  
pp. 138-141
Author(s):  
I.M. Utyashev
Keyword(s):  
Cross Section ◽  
Natural Frequencies ◽  
Liouville Problem ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Longitudinal Vibrations ◽  
Cross Sectional ◽  
Independent Functions ◽  
The Cross ◽  
The Right

Variable cross-section rods are used in many parts and mechanisms. For example, conical rods are widely used in percussion mechanisms. The strength of such parts directly depends on the natural frequencies of longitudinal vibrations. The paper presents a method that allows numerically finding the natural frequencies of longitudinal vibrations of an elastic rod with a variable cross section. This method is based on representing the cross-sectional area as an exponential function of a polynomial of degree n. Based on this idea, it was possible to formulate the Sturm-Liouville problem with boundary conditions of the third kind. The linearly independent functions of the general solution have the form of a power series in the variables x and λ, as a result of which the order of the characteristic equation depends on the choice of the number of terms in the series. The presented approach differs from the works of other authors both in the formulation and in the solution method. In the work, a rod with a rigidly fixed left end is considered, fixing on the right end can be either free, or elastic or rigid. The first three natural frequencies for various cross-sectional profiles are given. From the analysis of the numerical results it follows that in a rigidly fixed rod with thinning in the middle part, the first natural frequency is noticeably higher than that of a conical rod. It is shown that with an increase in the rigidity of fixation at the right end, the natural frequencies increase for all cross section profiles. The results of the study can be used to solve inverse problems of restoring the cross-sectional profile from a finite set of natural frequencies.

Biochemical and Histopathological Evaluation of the Radioprotective Effects of Melatonin Against Gamma Ray-Induced Skin Damage

2019 ◽  
Vol 12 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Dheyauldeen Shabeeb ◽  
Masoud Najafi ◽  
Ahmed Eleojo Musa ◽  
Mansoor Keshavarz ◽  
Alireza Shirazi ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Histopathological Examination ◽  
Radical Scavenging ◽  
Limiting Factor ◽  
Skin Damage ◽  
Exposed Skin ◽  
Male Wistar Rats ◽  
Time Periods ◽  
Skin Damages ◽  
The Right

Background:Radiotherapy is one of the treatment methods for cancers using ionizing radiations. About 70% of cancer patients undergo radiotherapy. Radiation effect on the skin is one of the main complications of radiotherapy and dose limiting factor. To ameliorate this complication, we used melatonin as a radioprotective agent due to its antioxidant and anti-inflammatory effects, free radical scavenging, improving overall survival after irradiation as well as minimizing the degree of DNA damage and frequency of chromosomal abrasions.Methods:Sixty male Wistar rats were randomly assigned to 4 groups: control (C), melatonin (M), radiation (R) and melatonin + radiation (MR). A single dose of 30 Gy gamma radiation was exposed to the right hind legs of the rats while 40 mg/ml of melatonin was administered 30 minutes before irradiation and 2 mg/ml once daily in the afternoon for one month till the date of rat’s sacrifice. Five rats from each group were sacrificed 4, 12 and 20 weeks after irradiation. Afterwards, their exposed skin tissues were examined histologically and biochemically.Results:In biochemical analysis, we found that malondialdehyde (MDA) levels significantly increased in R group and decreased significantly in M and MR groups after 4, 12, and 20 weeks, whereas catalase (CAT) and superoxide dismutase (SOD) activities decreased in the R group and increased in M and MR groups during the same time periods compared with the C group (p<0.05). Histopathological examination found there were statistically significant differences between R group compared with the C and M groups for the three different time periods (p<0.005, p<0.004 and p<0.004) respectively, while R group differed significantly with MR group (p<0.013). No significant differences were observed between C and M compared with MR group (p>0.05) at 4 and 20 weeks except for inflammation and hair follicle atrophy, while there were significant effects at 12 weeks (p<0.05).Conclusion:Melatonin can be successfully used for the prevention and treatment of radiation-induced skin injury. We recommend the use of melatonin in optimal and safe doses. These doses should be administered over a long period of time for effective radioprotection and amelioration of skin damages as well as improving the therapeutic ratio of radiotherapy.

scholarly journals Barking up the right tree: Are small groups rational agents?

2006 ◽  
Vol 9 (3) ◽  
pp. 209-222 ◽  
Author(s):  
James C. Cox ◽  
Stephen C. Hayne
Keyword(s):  
Small Groups ◽  
Rational Agents ◽  
The Right

UPAYA HUKUM TERHADAP ORANGTUA YANG TIDAK MELAKSANAKAN KEWAJIBAN ALIMENTASI DALAM PERSPEKTIF PERLINDUNGAN ANAK

2019 ◽  
Vol 7 (2) ◽  
pp. 307
Author(s):  
Tyas Sekar Mawarni ◽  
Anjar Sri Ciptorukmi Nugraheni
Keyword(s):  
Child Protection ◽  
Theoretical Studies ◽  
Cost Of Living ◽  
Legal Research ◽  
Conceptual Approach ◽  
Family Problems ◽  
The Law ◽  
The Right ◽  
Legal Substances

<p>Abstract</p><p>The purpose of this study is to explain the legal efforts that can be done if the parents do not implement the obligation of alimentation in the perspective of child protection. The method used is the method of legal research normatif (legal research), with the approach of the law (statute approach) and conceptual approach (conseptual approach). The legal substances used in this study include primary and secondary legal materials. The results of this study explain the parental remedies that do not carry out alimentation obligations in theoretical studies can be done by litigation or court and non-litigation or out of court. However, for non-litigation settlement in Indonesia is not yet available for family problems. Legal efforts through litigation may include the filing of livelihood rights and the execution of a permanent judge’s decision regarding the right of alimentation (cost of living).</p><p>Keywords: Legal effort;alimentation obligation; child; and child protection.</p><p> </p><p>Abstrak</p><p>Tujuan penelitian ini ialah untuk menjelaskan upaya hukum yang dapat dilakukan apabila orangtua tidak melaksanakan kewajiban alimentasi dalam perspektif perlindungan anak.Metode yang digunakan ialah metode penelitian hukum normatif (legal research), dengan pendekatan undang-undang (statute approach) dan pendekatan konseptual (conseptual approach).Bahan hukum yang dipergunakan dalam penelitian ini meliputi bahan hukum primer dan sekunder.Hasil penelitian ini menjelaskan mengenai upaya hukum orangtua yang tidak melaksanakan kewajiban alimentasi secara kajian teoritis dapat dilakukan dengan litigasi atau pengadilan dan non-litigasi atau di luar pengadilan.Namun, untuk penyelesaian melalui nonlitigasi di Indonesia belum difasilitasi Negara Mengenai masalah keluarga. Upaya hukum melalui Litigasi dapat berupa pengajuan hak nafkah dan eksekusi putusan hakim yang berkekuatan tetap mengenai hak alimentasi (biaya nafkah).</p><p>Kata Kunci: Upaya hukum; kewajiban alimentasi;anak;dan perlindungan anak.</p>

GLOBALIZATION AND INFLATION: NEW PANEL EVIDENCE

2015 ◽  
Vol 20 (1) ◽  
pp. 1-26 ◽  
Author(s):  
Dong-Hyeon Kim ◽  
Shu-Chin Lin ◽  
Yi-Chen Wu
Keyword(s):  
Cross Section ◽  
Political Institutions ◽  
Empirical Work ◽  
Panel Cointegration ◽  
Developed Countries ◽  
Data Sets ◽  
Legal Traditions ◽  
Heterogeneous Panel ◽  
Positive Effect

Recent empirical work on globalization and inflation analyzes multicountry data sets in panel and/or cross-section frameworks and reaches inconclusive results. This paper highlights their shortcomings and reexamines the issue utilizing heterogeneous panel cointegration techniques that allow for cross-section heterogeneity and dependence. It finds that in a sample of developing countries globalization of both trade and finance, on the average, exerts a significant and positive effect on inflation, whereas in a sample of developed countries there is, on the average, no significant impact of openness. Neither type of openness disciplines inflationary policy. Despite this, there are large variations in the effect across countries, due possibly to differences in the quality of political institutions, central bank independence, the exchange-rate regimes, financial development, and/or legal traditions.

scholarly journals Multidimensional Poverty Measurement in Pakistan :Time Series Trends and Breakdown

2012 ◽  
Vol 51 (4II) ◽  
pp. 493-504 ◽  
Author(s):  
Taseer Salahuddin ◽  
Asad Zaman
Keyword(s):  
Time Series ◽  
Recent Literature ◽  
Caloric Intake ◽  
Multidimensional Poverty ◽  
Poverty Measurement ◽  
New Approach ◽  
Rational Agents ◽  
Multidimensional Poverty Measurement ◽  
The Poor ◽  
The Right

In the recent literature, consensus has emerged that poverty is a multidimensional phenomenon; see Alkire and Santos (2010) for a review of the major arguments. Nonetheless, the most widely used measures of poverty remain unidimensional, being based on income or caloric intake cutoffs. The logic for the use of income based measures was that it was only lack of income which led to deprivation—with sufficient income; rational agents would automatically eliminate deprivations in all dimensions in the right sequence of priorities. However, careful studies like Thorbecke (2005) and Banerjee and Duflo (2006) show that this does not happen. Even while malnourished and underfed, the poor spend significant portions of their budgets on festivals, weddings, alcohol, tobacco and other non-essential items. The move from abstract theoretical speculation based on mathematical models of human behaviour to experiments and observations of actual behaviour has led to dramatic changes in the understanding of poverty and how to alleviate it. Some of these insights are encapsulated in a new approach to poverty advocated by Banerjee and Duflo (2011).

Free Trade and the Widening Gap Between Rich and Poor Countries

2001 ◽  
Vol 8 (2) ◽  
pp. 24
Author(s):  
Kelli Ketover
Keyword(s):  
Trade Policy ◽  
Multinational Corporations ◽  
Free Trade ◽  
Fair Trade ◽  
Well Being ◽  
Policy Debate ◽  
Poor Countries ◽  
Distribution Of Wealth ◽  
Free Trade Policy ◽  
The Right

The gap between the world's poorest nations and the world's wealthiest nations continues to grow despite the promises made by the proponents of globalization. Increasingly, however, “new internationalists" argue that free trade policy should be reconstituted as fair trade policy. Current policies have only served to strengthen the influence multinational corporations have over the policy debate. The tradeoff has often been at the expense of qualities not easily measured in economic terms such as human rights, depletion of natural resources, and inequitable distribution of wealth. Future trade policy will have to contend with competing forces issuing from those fearing loss of national sovereignty on the right and others concerned with social and environmental well being on the left.

Non-Maxwellian kinetic equations modeling the dynamics of wealth distribution

2020 ◽  
Vol 30 (04) ◽  
pp. 685-725 ◽  
Author(s):  
Giulia Furioli ◽  
Ada Pulvirenti ◽  
Elide Terraneo ◽  
Giuseppe Toscani
Keyword(s):  
Steady State ◽  
Wealth Distribution ◽  
Kinetic Equations ◽  
Planck Equation ◽  
Logarithmic Sobolev Inequality ◽  
One Dimensional ◽  
Distribution Of Wealth ◽  
Multi Agent ◽  
Fokker Planck Equations ◽  
Fokker Planck

We introduce a class of new one-dimensional linear Fokker–Planck-type equations describing the dynamics of the distribution of wealth in a multi-agent society. The equations are obtained, via a standard limiting procedure, by introducing an economically relevant variant to the kinetic model introduced in 2005 by Cordier, Pareschi and Toscani according to previous studies by Bouchaud and Mézard. The steady state of wealth predicted by these new Fokker–Planck equations remains unchanged with respect to the steady state of the original Fokker–Planck equation. However, unlike the original equation, it is proven by a new logarithmic Sobolev inequality with weight and classical entropy methods that the solution converges exponentially fast to equilibrium.

scholarly journals Reflected entropy for an evaporating black hole

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Tianyi Li ◽  
Jinwei Chu ◽  
Yang Zhou
Keyword(s):  
Black Hole ◽  
Cross Section ◽  
Early Time ◽  
Three Dimensions ◽  
Late Time ◽  
Mixed States ◽  
Correlation Measure ◽  
Extremal Surface ◽  
Brane Model ◽  
The Right

Abstract We study reflected entropy as a mixed state correlation measure in black hole evaporation. As a measure for bipartite mixed states, reflected entropy can be computed between black hole and radiation, radiation and radiation, and even black hole and black hole. We compute reflected entropy curves in three different models: 3-side wormhole model, End-of-the-World (EOW) brane model in three dimensions and two-dimensional eternal black hole plus CFT model. For 3-side wormhole model, we find that reflected entropy is dual to island cross section. The reflected entropy between radiation and black hole increases at early time and then decreases to zero, similar to Page curve, but with a later transition time. The reflected entropy between radiation and radiation first increases and then saturates. For the EOW brane model, similar behaviors of reflected entropy are found.We propose a quantum extremal surface for reflected entropy, which we call quantum extremal cross section. In the eternal black hole plus CFT model, we find a generalized formula for reflected entropy with island cross section as its area term by considering the right half as the canonical purification of the left. Interestingly, the reflected entropy curve between the left black hole and the left radiation is nothing but the Page curve. We also find that reflected entropy between the left black hole and the right black hole decreases and goes to zero at late time. The reflected entropy between radiation and radiation increases at early time and saturates at late time.

Nucleon-Nucleon Scattering Calculations in a Pole Regularized Spinor Theory

1974 ◽  
Vol 29 (7) ◽  
pp. 981-990
Author(s):  
K. Dammeier
Keyword(s):  
Quantum Theory ◽  
Cross Section ◽  
Test Object ◽  
Nucleon Nucleon ◽  
Coupling Constant ◽  
Nonlinear Spinor ◽  
Spinor Theory ◽  
Order Of Magnitude ◽  
The Right ◽  
Right Order

A pole regularized nonlinear spinor theory may be a suitable test object to compare scattering calculations of Stumpf's functional quantum theory with LSZ-results. To apply the LSZ-technique in this theory, a dressing of the occurring massless Green's function is necessary. It is shown which special approximations allow for this dressing. The renormalized nucleon-nucleon coupling constant yields the right order of magnitude for the elastic nucleon cross section.

Sign in / Sign up

Export Citation Format

Share Document