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Abstract
Standard economic theory does not capture trust among anonymous Internet traders. But when traders are allowed to have social preferences, uncertainty about a seller's morals opens t he door for trust, reward, exploitation and reputation building. We report experiments suggesting that sellers' intrinsic motivations to be trustworthy are not sufficient to sustain trade when not complemented by a feedback system. We demonstrate that it is the interaction of social preferences and cleverly designed reputation mechanisms that solves to a large extent the trust problem on Internet market platforms. However, economic theory and social preference models tend to underestimate the difficulties of promoting trust in anonymous online trading communities.

We study a classic mechanism design problem: How to organize trade between two privately informed parties. We characterize an optimal mechanism under selfish preferences and present experimental evidence that, under such a mechanism, a non-negligible fraction of individuals deviates from the intended behavior. We show that this can be explained by models of social preferences and introduce the notion of a social-preference-robust mechanism. We characterize an optimal mechanism in this class and present experimental evidence that it successfully controls behavior. We finally show that this mechanism is more profitable only if deviations from selfish behavior are sufficiently frequent.

Motivated by recent research on survey data, we test the influence of the political regime on social norms under controlled laboratory conditions. Comparing solidarity behavior revealed by East and West Germans in 1995 and 2009, we find that East Germans persistently show much less solidarity than West Germans. Twenty years after the fall of the Berlin Wall, social norms of solidarity have not converged. This suggests that norms of social behavior change much more slowly than the political environment.

Why the traditional "pledge and review" climate agreements have failed, and how carbon pricing, based on trust and reciprocity, could succeed. After twenty-five years of failure, climate negotiations continue to use a "pledge and review" approach: countries pledge (almost anything), subject to (unenforced) review. This approach ignores everything we know about human cooperation. In this book, leading economists describe an alternate model for climate agreements, drawing on the work of the late Nobel laureate Elinor Ostrom and others. They show that a "common commitment" scheme is more effective than an "individual commitment" scheme; the latter depends on altruism while the former involves reciprocity ("we will if you will"). The contributors propose that global carbon pricing is the best candidate for a reciprocal common commitment in climate negotiations. Each country would commit to placing charges on carbon emissions sufficient to match an agreed global price formula. The contributors show that carbon pricing would facilitate negotiations and enforcement, improve efficiency and flexibility, and make other climate policies more effective. Additionally, they analyze the failings of the 2015 Paris climate conference. Contributors: Richard N. Cooper, Peter Cramton, Ottmar Edenhofer, Christian Gollier, Éloi Laurent, David JC MacKay, William Nordhaus, Axel Ockenfels, Joseph E. Stiglitz, Steven Stoft, Jean Tirole, Martin L. Weitzman.

Why the traditional "pledge and review" climate agreements have failed, and how carbon pricing, based on trust and reciprocity, could succeed.After twenty-five years of failure, climate negotiations continue to use a "pledge and review" approach: countries pledge (almost anything), subject to (unenforced) review. This approach ignores everything we know about human cooperation. In this book, leading economists describe an alternate model for climate agreements, drawing on the work of the late Nobel laureate Elinor Ostrom and others. They show that a "common commitment" scheme is more effective than an "individual commitment" scheme; the latter depends on altruism while the former involves reciprocity ("we will if you will").The contributors propose that global carbon pricing is the best candidate for a reciprocal common commitment in climate negotiations. Each country would commit to placing charges on carbon emissions sufficient to match an agreed global price formula. The contributors show that carbon pricing would facilitate negotiations and enforcement, improve efficiency and flexibility, and make other climate policies more effective. Additionally, they analyze the failings of the 2015 Paris climate conference.ContributorsRichard N. Cooper, Peter Cramton, Ottmar Edenhofer, Christian Gollier, Éloi Laurent, David JC MacKay, William Nordhaus, Axel Ockenfels, Joseph E. Stiglitz, Steven Stoft, Jean Tirole, Martin L. Weitzman

Using data from laboratory experiments, we find that East Germans show consistently less solidarity than West Germans; there has been no convergence in the 20 years after the reunification. While it has recently been estimated that political values converge 20 to 40 years after the reunification (Alesina and Fuchs-Schundeln, 2007), we conclude from our findings that social behavior changes more slowly than political values. We hypothesize that this is due to complementarities involved in individual social behavior and the necessity to coordinate on social norms on the society level. (C) 2011 Elsevier B.V. All rights reserved.

SummaryMost social scientists' views of conflict and cooperation in society are shaped by very elementary, one‐off, two by two symmetric simultaneous move games like prisoner's dilemma, chicken, assurance or stag hunt. We think that this diet of examples leads to biased accounts in particular of distributional conflict, and therefore suggest that asymmetry in payoffs and move structure be taken into account systematically. In this paper a new paradigm of asymmetric games to study basic distributional conflicts is introduced, illustrated numerically and discussed theoretically. The results of exploratory experiments on the empirical side of the matter are also reported.

The book identifies conditions for trust and cooperation. It highlights unintended consequences of individually rational behavior, and shows how trust and cooperation change dependent on social embeddedness. Such analyses inspire experimental tests in lab conditions, but also tests through empirical applications in field studies. The results of this mixed-method approach can in turn be used to inspire further theoretical work.

AbstractWe examine some of the opportunities and challenges concerned with establishing a centralized national kidney exchange program in Germany. Despite the many advantages of a national program, without deliberate design and policy intervention, a fragmented kidney exchange program may emerge. We study a number of collaboration strategies, and resulting simulations suggest that transplant centers may find it advantageous not to fully participate, resulting in a net reduction in the number of transplants. These results also suggest that allowing more forms of kidney exchange, such as three-way exchanges and non-directed donations, can significantly increase the number of transplants while making participation in a national program more attractive and thus national coordination and cooperation more robust. We propose a multi-level policy approach that is easy to implement and would promote an efficient German kidney exchange program that benefits recipients, donors and hospitals.