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This paper presents a model of group formation based on the assumption that individuals prefer to associate with people similar to them. It is shown that, in general, if the number of groups that can be formed is bounded, then a stable partition of the society into groups may not exist. (A partition is defined as stable if none of the individuals would prefer be in a different group than the one he is in.) However, if individuals' characteristics are one-dimensional, then a stable partition always exists. We give sufficient conditions for stable partitions to be segregating (in the sense that, for example, low-characteristic individuals are in one group and high-characteristic ones are in another) and Pareto efficient. In addition, we propose a dynamic model of individual myopic behavior describing the evolution of group formation to an eventual stable, segregating, and Pareto efficient partition. Journal of Economic Literature Classification Numbers: C72, H41. 相似文献
3.
The demand commitment bargaining and snowballing cooperation 总被引:1,自引:0,他引:1
Eyal Winter 《Economic Theory》1994,4(2):255-273
Summary A multi-person bargaining model based on sequential demands is studied for coalitional games with increasing returns to scale for cooperation. We show that for such games the (subgame perfect) equilibrium behavior leads to a payoff distribution which approaches the Shapley value as the money unit approaches 0. Subgame consistency and strategic equilibria are the main tools used in the analysis. The model is then applied to study a problem of public good consumption.I wish to thank Reinhard Selten, who introduced me with the topic of non-cooperative coalition bargaining, for many constructive discussions. Al Roth's warm hospitality during the academic year 1990–1991, as well as many useful remarks are also gratefully acknowledged. Helpful discussions with Dieter Balkenborg, Tatsuro Ichiishi, Richard Mclean, Benny Moldovanu, Daniel Seidmann Avner Shaked are gratefully acknowledged as well. Part of this research was also supported by the Deutscheforschungsgemeinschaft SFB 303 at the University of Bonn. 相似文献
4.
The Borda rule,Condorcet consistency and Condorcet stability 总被引:1,自引:0,他引:1
Summary. The Borda rule is known to be the least vulnerable scoring rule to Condorcet inconsistency, Saari (2000). Such inconsistency
occurs when the Condorcet winner (the alternative which is preferred to any other alternative by a simple majority) is not
selected by the Borda rule. This note exposes the relationship between the Borda rule and the Condorcet q-majority principle as well as the Condorcet q-majority voting rule. The main result establishes that the Borda rule is Condorcet q-majority consistent when where k is the number of alternatives. The second result establishes that is the minimal degree of majority decisiveness corresponding to the Borda rule under sincere voting. The same majority is
required to ensure decisiveness under the Borda rule and to ensure that a q-rule (the generalized q-majority Condorcet rule) is a voting rule.
Received: April 8, 2002; revised version: July 17, 2002
Correspondence to:S. Nitzan 相似文献
5.
Pension Reform, Capital Markets and the Rate of Return 总被引:1,自引:0,他引:1
Axel Börsch-Supan Florian Heiss Alexander Ludwig Joachim Winter 《The German Economic Review》2003,4(2):151-181
Abstract. This paper discusses the consequences of population aging and a fundamental pension reform – that is, a shift towards more pre‐funding – for capital markets in Germany. We use a stylized closed‐economy, overlapping‐generations model to compare the effects of the recent German pension reform with those of a more decisive reform that would freeze the current pay‐as‐you‐go contribution rate and thus result in a larger funded component of the pension system. We predict rates of return to capital under both reform scenarios over a long horizon, taking demographic projections as given. Our main finding is that the future decrease in the rate of return is much smaller than often claimed in the public debate. Our simulations show that the capital stock will decrease once the baby‐boom generations enter retirement, even if there were no fundamental pension reform. The corresponding decrease in the rate of return, the direct effect of population aging, is around 0.7 percentage points. While the capital market effects of the recent German pension reform are marginal, the rate of return to capital would decrease by an additional 0.5 percentage points under the more decisive reform proposal. 相似文献
6.
Gerrit Winter 《保险科学杂志》2005,94(1):105-156
While financial state supervision has intensified legal supervision of insurance companies, the doctrine of the state’ s duty to protect constitutional rights of the insured has consistently been rolled back: merely legality control, the principle of subsidiarity in § 81 Insurance Supervision Act, the model of the informed consumer and the rejection of the trust models. Insurance companies are protected by national constitutional rights, European law and in particular by the principle of necessity. The aim of state supervision is not only to protect the insured, but also to guarantee a well-functioning private insurance industry. To some extent, state supervision is acquiring a merely warranting character; consensual administration is becoming more common — this does not, however, alter the aims of supervision. 相似文献
7.
Richard Winter 《Journal of Business Ethics》2011,98(2):297-306
Understanding how the professional ideals and values of partners influence lawyers’ everyday life is a relatively unexplored
area given the inherent difficulties of gaining access to lawyers. This case study sheds light on the professional ideals
and ethical values of partners and lawyers in a mid-tier Sydney law firm. Semi-structured interviews with partners and lawyers/legal
clerks reveal how partners’ professional ideals and ethical values play a pivotal role in: (1) upholding positive normative
evaluations of lawyer/firm propriety (moral legitimacy), (2) stressing the importance of a balanced working life (cognitive
legitimacy) and (3) satisfying younger lawyers’ needs for personal support, autonomy and responsibility (pragmatic legitimacy).
The principled actions of partners are portrayed as the cornerstone of shaping a moral community in legal practise. 相似文献
8.
9.
Consider a market with finitely many firms, each enjoying an uncertain growth. We assume the (random) growth rates of these firms are independent and identically distributed. We show that the asymptotic probability distribution of the market shares gives each firm an equal probability of dominating the market (while all other firms are almost extinguished). In particular, these conclusions are independent of the initial market shares of the firms. We conclude that sample paths fluctuate between almost domination and almost extinction. We also demonstrate that these fluctuations may be very slow. Extensions to situations where the total demand is restricted are discussed. 相似文献
10.
We consider games in characteristic function form where the worth of a group of players depends on the numbers of players of each of a finite number of types in the group. The games have bounded essential coalition sizes: all gains to cooperation can be achieved by coalitions bounded in absolute size (although larger coalitions are permitted they cannot realize larger per-capita gains). We show that the utility function of the corresponding "limit" market, introduced in Wooders (1988, 1994a) , is piecewise linear. The piecewise linearity is used to show that for almost all limiting ratios of percentages of player-types, as the games increase in size (numbers of players), asymptotically the games have cores containing only one payoff, and this payoff is symmetric (treats players of the same type identically). We use this result to show that for almost all limiting ratios of percentages of player-types, Shapley values of sequences of growing games converge to the unique limiting payoff. 相似文献