Incorporating Fairness Motives into the Impulse Balance Equilibrium and Quantal Response Equilibrium Concepts: An Application to 2x2 Games

Substantial evidence has accumulated in recent empirical works on the limited ability of the Nash equilibrium to rationalize observed behavior in many classes of games played by experimental subjects. This realization has led to several attempts aimed at finding tractable equilibrium concepts which perform better empirically; one such example is the impulse balance equilibrium (Selten, Chmura, 2008), which introduces a psychological reference point to which players compare the available payoff allocations. This paper is concerned with advancing two new, empirically sound, concepts: equity-driven impulse balance equilibrium (EIBE) and equity-driven quantal response equilibrium (EQRE): both introduce a distributive reference point to the corresponding established stationary concepts known as impulse balance equilibrium (IBE) and quantal response equilibrium (QRE). The explanatory power of the considered models leads to the following ranking, starting with the most successful in terms of fit to the experimental data: EQRE, IBE, EIBE, QRE and Nash equilibrium.Fairness, Inequity aversion, Aspiration level, Impulse balance, Quantal Response, Behavioral economics, Experimental economics

Long-term scenarios: energy pathways in the UK

The bottom-up approach promoted through the Paris Agreement and signed in 2016 requires the definition of accurate and realistic national pathways to cut emissions. A recent study applied to the UK energy system shows that current UK policy on climate change is incompatible with the most stringent climate objectives

Evolutionary escape from the climate dilemma: comment on “climate change governance, cooperation and self-organization” by Pacheco, Vasconcelos and Santos

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The Survival of the Conformist: Social Pressure and Renewable Resource Management

This paper examines the role of pro-social behavior as a mechanism for the establishment and maintenance of cooperation in resource use under variable social and environmental conditions. By coupling resource stock dynamics with social dynamics concerning compliance to a social norm prescribing non-excessive resource extraction in a common pool resource (CPR), we show that when reputational considerations matter and a sufficient level of social stigma affects the violators of a norm, sustainable outcomes are achieved. We find large parameter regions where norm-observing and norm-violating types coexist, and analyze to what extent such coexistence depends on the environment.Cooperation, Social Norm, Ostracism, Common Pool Resource, Evolutionary Game Theory, Replicator Equation, Agent-based Simulation, Coupled Socio-resource Dynamics

Coordinating to protect the global climate: Experimental evidence on the role of inequality and commitment

Free riding and coordination difficulties are held to be the primary causes of cooperation breakdown among nonrelatives. These thwarting effects are particularly severe in the absence of effective monitoring institutions capable of sanctioning deviant behavior. Unfortunately, solutions to global environmental dilemmas, like climate change, cannot depend on coercion mechanisms, given the transnational effects of emissions. A further complication is that it yields 'common but differentiated responsibilities'. Such asymmetries in wealth and carbon responsibilities among the actors, and the ensuing issues of equity, might further impede cooperation. Yet, a growing literature stresses the importance of non-economic factors in explaining human behavior; therefore, instruments that go beyond the traditional incentives might prove effective in facilitating the task. Given the empirical nature of the problem, we address it by means of a controlled laboratory experiment: a framed threshold public goods game is used to investigate the degree of cooperation and coordination achieved by groups of six participants in combating simulated catastrophic climate change. While necessarily simple for the sake of tractability, the game is designed to incorporate key real-world issues, such as inequity and the impact of emergent institutions based on nonbinding 'pledge and review' mechanisms. --experimental economics,threshold public goods game,climate change,inequality,pledge

A bargaining experiment on heterogeneity and sidedeals in climate negotiations

The recent global climate change agreement in Paris leaves a wide gap between pledged and requisite emissions reductions in keeping with the commonly accepted 2°C target. A recent strand of theoretical and experimental evidence establishes pessimistic predictions concerning the ability of comprehensive global environmental agreements to improve upon the business-as-usual trajectory. We introduce an economic experiment focusing on the dynamics of the negotiation process by observing subjects’ behavior in a Nash bargaining game. Throughout repeated rounds, heterogeneous players bargain over the allocation of a fixed amount of profit-generating emissions with significant losses attached to prolonged failure to reach agreement. We find that the existence of side agreements that constrain individual demands among a subset of like countries does not ensure success; however, such side agreements reduce the demands of high-emission parties. Our results highlight the importance of strong signals amongst high emitters in reaching agreement to shoulder a collective emissions reduction target

Think locally, act globally

Individuals follow local social norms in adopting climate-friendly behaviour, write Stefano Carattini and Alessandro Tavon

When enough countries lead by example, they create a tipping point for climate agreements

But uncertainties risk reverting the game back to a 'prisoner's dilemma' and inaction, write İriş and Tavon

Loss aversion in international environmental agreements

We study the impact of loss-aversion and the threat of critical damages from insufficient pollutant abatement, which we jointly call threshold concerns, on the outcome of international environmental agreements. We aim to understand whether concerns for a critical level of damages induce cooperation among countries faced with the well-known free-riding problem, and yield sufficient emission reductions to avoid exceeding the threshold. Specifically, we focus on loss-averse countries negotiating under the threat of either high or low environmental damages. Under symmetry, when countries display identical degrees of threshold concern, we show that such beliefs have a positive effect on reducing the emission levels of both signatories to the treaty and non-signatories, leading to weakly larger coalitions of signatories than in the absence of reference dependence. We then introduce asymmetry, by allowing countries to differ in the degree of concern about the damages. We show that stable coalitions are mostly formed by the countries with higher threshold concerns. When enough countries exhibit standard preferences, the coalition size may diminish, regardless of the degree of concern by the others

How Green Are Green Economists?

This paper analyzes the decision of “green” economists to participate in the carbon offset market, and how this decision is related with the views that these experts hold on offsets. It also compares the preferences of economists with those of the general public, as emphasized in the literature. The paper exploits a unique dataset examining the decision to purchase carbon offsets at two academic conferences in environmental and ecological economics. We find that having the conference expenses covered by one\u27s institution increases the likelihood of offsetting, but practical and ethical reservations as well as personal characteristics and preferences also play an important role. We focus on the effect of objecting to the use of offsets and discuss the implications for practitioners and policy-makers. Based on our findings, we suggest that ecological and environmental economists should be more involved in the design and use of carbon offsets