scholarly journals Multiplicative Pacing Equilibria in Auction Markets

2021 ◽  
Author(s):  
Vincent Conitzer ◽  
Christian Kroer ◽  
Eric Sodomka ◽  
Nicolas E. Stier-Moses
Keyword(s):  
Game Theory ◽  
Significant Role ◽  
Real World ◽  
Existence And Uniqueness ◽  
Computational Study ◽  
Exact Algorithm ◽  
The Other ◽  
Auction Markets ◽  
Auction Mechanism ◽  
Multiplicative Factor

Budgets play a significant role in ad markets that implement sequential auctions such as those hosted by internet companies. In “Multiplicative Pacing Equilibria in Auction Markets,” the authors look at pacing in an ad marketplace using the lens of game theory. The goal is understanding how bids must be shaded to maximize advertiser welfare, at equilibrium. Motivated by the real-world auction mechanism, they construct a game where advertisers in the auctions choose a multiplicative factor not larger than 1 to possibly reduce their bids and best respond to the other advertisers. The article studies the theoretical properties of the game such as existence and uniqueness of equilibria, offers an exact algorithm to compute them, connects the game to well-known abstractions such as Fisher markets, and performs a computational study with real-world-inspired instances. The main insights are that the solutions to the studied game can be used to improve the outcomes achieved by a closer-to-reality dynamic pacing algorithm and that buyers do not have an incentive to misreport bids or budgets when there are enough participants in the auction.

POLITICS-LAW CONVERGENCE OR DIVERGENCE? 'SMALL' POLITICAL PARTIES, REALPOLITIKAND SOUTH AFRICA'S 20 YEARS OF DEMOCRACY

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Kealeboga J Maphunye
Keyword(s):  
Game Theory ◽  
Political Parties ◽  
Rational Choice ◽  
Significant Role ◽  
Rational Choice Theory ◽  
Choice Theory ◽  
Democratic Consolidation ◽  
Secondary Research ◽  
Extant Literature ◽  
African Charter

This article examines South Africa's 20-year democracy by contextualising the roles of the 'small' political parties that contested South Africa's 2014 elections. Through the  prism  of South  Africa's  Constitution,  electoral legislation  and the African Charter on Democracy, Elections and Governance, it examines these parties' roles in South Africa's democratisation; their influence,  if any, in parliament, and whether they play any role in South Africa's continental or international engagements. Based on a review of the extant literature, official documents,  legislation, media, secondary research, reports and the results of South Africa's elections, the article relies on game theory, rational choice theory and theories of democracy and democratic consolidation to examine 'small' political parties' roles in the country's political and legal systems. It concludes that the roles of 'small' parties in governance and democracy deserve greater recognition than is currently the case, but acknowledges the extreme difficulty experienced by the 'small'  parties in playing a significant role in democratic consolidation, given their formidable opponent in a one-party dominant system.

The SADC Tribunal

2018 ◽  
Author(s):  
E. Tendayi Achiume
Keyword(s):  
Human Rights ◽  
Significant Role ◽  
Economic History ◽  
Southern African Development Community ◽  
The Other ◽  
Legal Decision ◽  
African Development ◽  
Sociopolitical Context ◽  
Judicial Lawmaking

This chapter uses the trajectory of the Southern African Development Community (“SADC”) Tribunal to chart sociopolitical constraints on international judicial lawmaking. It studies the SADC Tribunal backlash case, which paved the way for a curtailment of the Tribunal’s authority, stripping the Tribunal of both private access and its jurisdiction over human rights. Showing how jurisprudential engagement with sociopolitical context plays a significant role in explaining the Tribunal's loss of authority, the chapter introduces the concept of sociopolitical dissonance. Sociopolitical dissonance is a state that results when a legal decision contradicts or undermines deeply held norms that a given society or community forms on the basis of its social, political, and economic history. Sociopolitical resonance, on the other hand, describes the quality of affirming or according with a given society's norms as informed by its sociopolitical history.

scholarly journals Sustainable Consumer Behavior in Purchasing, Using and Disposing of Clothes

2021 ◽  
Vol 13 (15) ◽  
pp. 8333
Author(s):  
Mirella Soyer ◽  
Koen Dittrich
Keyword(s):  
Consumer Behavior ◽  
The Netherlands ◽  
Multiple Regression ◽  
Significant Role ◽  
Social Motivation ◽  
The Other ◽  
Social Evaluation ◽  
Sustainable Practices ◽  
Usage Phase ◽  
The Core

In this study we investigate how consumers in The Netherlands can be persuaded to adopt sustainable practices when purchasing, using and disposing of clothes. This study investigates the attitude-behavior gap for the sustainable choices for purchase, use and disposing of clothes. For each consumption phase we ran a two-step multiple regression. The findings showed that the importance of the factors vary in the three consumption phases. For purchasing and disposal decisions, the core motivator social motivation predicts sustainable practices best, while it has no role in the usage phase. The factor ability appeared to have a significant role in the disposal phase, but not in the other phases. Finally, the trigger appears to lower the consumers’ ability in the purchasing phase, while it enhances the core motivator social evaluation in the disposal phase.

scholarly journals Computational Study of the Electron Spectra of Vapor-Phase Indole and Four Azaindoles

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1947
Author(s):  
Delano P. Chong
Keyword(s):  
Density Functional Theory ◽  
Vapor Phase ◽  
Density Functional ◽  
Computational Study ◽  
Geometry Optimization ◽  
The Other ◽  
Functional Theory ◽  
Electron Spectra

After geometry optimization, the electron spectra of indole and four azaindoles are calculated by density functional theory. Available experimental photoemission and excitation data for indole and 7-azaindole are used to compare with the theoretical values. The results for the other azaindoles are presented as predictions to help the interpretation of experimental spectra when they become available.

Improving the External Validity of Conjoint Analysis: The Essential Role of Profile Distribution

2021 ◽  
pp. 1-27 ◽  
Author(s):  
Brandon de la Cuesta ◽  
Naoki Egami ◽  
Kosuke Imai
Keyword(s):  
Conjoint Analysis ◽  
Real World ◽  
External Validity ◽  
Causal Effect ◽  
The Other ◽  
Estimation Methods ◽  
Social Scientists ◽  
Actual Distribution ◽  
Open Source Software Package ◽  
Profile Distribution

Abstract Conjoint analysis has become popular among social scientists for measuring multidimensional preferences. When analyzing such experiments, researchers often focus on the average marginal component effect (AMCE), which represents the causal effect of a single profile attribute while averaging over the remaining attributes. What has been overlooked, however, is the fact that the AMCE critically relies upon the distribution of the other attributes used for the averaging. Although most experiments employ the uniform distribution, which equally weights each profile, both the actual distribution of profiles in the real world and the distribution of theoretical interest are often far from uniform. This mismatch can severely compromise the external validity of conjoint analysis. We empirically demonstrate that estimates of the AMCE can be substantially different when averaging over the target profile distribution instead of uniform. We propose new experimental designs and estimation methods that incorporate substantive knowledge about the profile distribution. We illustrate our methodology through two empirical applications, one using a real-world distribution and the other based on a counterfactual distribution motivated by a theoretical consideration. The proposed methodology is implemented through an open-source software package.

Traditional Polity and the Dynamics of Change in India

1963 ◽  
Vol 22 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Joan Bondurant
Keyword(s):  
Intellectual History ◽  
Significant Role ◽  
The Other ◽  
The One

The title of this essay begins with the word traditional and it moves towards the idea of change. As is well known, these terms—tradition and change—are not opposites, nor are they to be understood in contradistinction to one another. It is important in this context to avoid the temptation to treat them as contradictory or to draw contrasts between what one considers on the one hand traditional, and on the other, changing. One cannot accurately speak of what was as over against what will be, or what is becoming. Nor can one view the ancient as opposed to that which is modern. Clearly, the opposite of change is permanence and persistence, and is not—at least not necessarily—to be couched in terms of the traditional. One need only to remind oneself that among the most compelling elements in the West's intellectual history is the idea of progress, to understand that there are indeed traditions in which the notion of change itself has played a significant role. And so it does not follow that "traditional Indian polity" is a set of concepts to be placed over against the "dynamics of change"—quite the contrary, as I shall try to show in what follows.

Coalitions and Government Formation: An Empirically Relevant Theory

1978 ◽  
Vol 8 (4) ◽  
pp. 459-477 ◽  
Author(s):  
Ian Budge ◽  
Valentine Herman
Keyword(s):  
Game Theory ◽  
Real World ◽  
Coalition Formation ◽  
Government Formation ◽  
The Real ◽  
Relevant Theory ◽  
The Government ◽  
Number Of Parties ◽  
Government Coalition

Traditional theories of government coalition formation concentrate on formal criteria inspired by – if not directly drawn from – game theory. One such criterion is that the coalition which forms must be winning; another is that it should have no surplus members without whom it would still be winning, i.e. it should be minimal; and a third is that the number of parties should be as few as possible. The closest that such theories come to considering the substantive issues affecting the formation of coalitions in the real world is their focus on reducing the ideological diversity of parties within the government. On many occasions, however, such ideological considerations receive negligible attention from politicians, who often ignore size factors altogether.

scholarly journals A Fractional SAIDR Model in the Frame of Atangana–Baleanu Derivative

2021 ◽  
Vol 5 (2) ◽  
pp. 32
Author(s):  
Esmehan Uçar ◽  
Sümeyra Uçar ◽  
Fırat Evirgen ◽  
Necati Özdemir
Keyword(s):  
Existence And Uniqueness ◽  
Laplace Transformation ◽  
Cell Phones ◽  
Mobile Network ◽  
The Other ◽  
Banach Fixed Point Theorem ◽  
Propagation Models ◽  
Computer Worms ◽  
Computer Viruses ◽  
The Stability

It is possible to produce mobile phone worms, which are computer viruses with the ability to command the running of cell phones by taking advantage of their flaws, to be transmitted from one device to the other with increasing numbers. In our day, one of the services to gain currency for circulating these malignant worms is SMS. The distinctions of computers from mobile devices render the existing propagation models of computer worms unable to start operating instantaneously in the mobile network, and this is particularly valid for the SMS framework. The susceptible–affected–infectious–suspended–recovered model with a classical derivative (abbreviated as SAIDR) was coined by Xiao et al., (2017) in order to correctly estimate the spread of worms by means of SMS. This study is the first to implement an Atangana–Baleanu (AB) derivative in association with the fractional SAIDR model, depending upon the SAIDR model. The existence and uniqueness of the drinking model solutions together with the stability analysis are shown through the Banach fixed point theorem. The special solution of the model is investigated using the Laplace transformation and then we present a set of numeric graphics by varying the fractional-order θ with the intention of showing the effectiveness of the fractional derivative.

scholarly journals Quantum Mean-Field Games with the Observations of Counting Type

Games ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 7
Author(s):  
Vassili N. Kolokoltsov
Keyword(s):  
Game Theory ◽  
Nash Equilibrium ◽  
Open Problem ◽  
Existence And Uniqueness ◽  
Existence Of Solutions ◽  
Mean Field ◽  
Mean Field Games ◽  
Quantum Game ◽  
Quantum Games ◽  
Interesting Open Problem

Quantum games and mean-field games (MFG) represent two important new branches of game theory. In a recent paper the author developed quantum MFGs merging these two branches. These quantum MFGs were based on the theory of continuous quantum observations and filtering of diffusive type. In the present paper we develop the analogous quantum MFG theory based on continuous quantum observations and filtering of counting type. However, proving existence and uniqueness of the solutions for resulting limiting forward-backward system based on jump-type processes on manifolds seems to be more complicated than for diffusions. In this paper we only prove that if a solution exists, then it gives an ϵ-Nash equilibrium for the corresponding N-player quantum game. The existence of solutions is suggested as an interesting open problem.

Research on SUE DTA Model with Constant Demand Based on Probit Model

2011 ◽  
Vol 374-377 ◽  
pp. 2605-2609
Author(s):  
Lei Shi ◽  
Li Gao
Keyword(s):  
Logit Model ◽  
Existence And Uniqueness ◽  
Probit Model ◽  
The Other ◽  
A Algorithm ◽  
Model Based

Logit model is among the most important model in SUE DTA study. A lot of work have been done based on Logit model. As the other very important SUE DTA model, Probit model has not been the focus of many researcher. This paper presents a SUE model based on Probit model, which aims at building up the Probit model with constant demand. The existence and uniqueness of the model is presented, Finally, a algorithm is given.

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