On the Economics and Biology of Trust

In recent years, many social scientists have claimed that trust plays an important role in economic and social transactions. Despite its proposed importance, the measurement and the definition of trust seem to be not fully settled, and the identification of the exact role of trust in economic interactions has proven to be elusive. It is still not clear whether trust is just an epiphenomenon of good institutions or whether it plays an independent causal role capable of shaping important aggregate economic outcomes. In this paper, I rely on a behavioral definition of trust that enables us to relate it to economic primitives such as preferences and beliefs. I review strong biological and behavioral evidence indicating that trusting is not just a special case of risk-taking, but based on important forms of social preferences such as betrayal aversion. Behaviorally defined trust also opens the door for understanding national and ethnic trust differences in terms of differences in preferences and beliefs, and it suggests ways to examine and interpret a causal role of trust.trust, preferences, beliefs, biological basis

The economics of impatience

In experiments, animals often prefer smaller, immediate rewards over larger rewards that are deferred — thus failing to maximize their total gain. Many people exhibit similar behaviour.economics, impatience

Psychological Foundations of Incentives

Psychological Foundations, Incentives

On the Economics and Biology of Trust

In recent years, many social scientists have claimed that trust plays an important role in economic and social transactions. Despite its proposed importance, the measurement and the definition of trust seem to be not fully settled, and the identification of the exact role of trust in economic interactions has proven to be elusive. It is still not clear whether trust is just an epiphenomenon of good institutions or whether it plays an independent causal role capable of shaping important aggregate economic outcomes. In this paper, I rely on a behavioral definition of trust that enables us to relate it to economic primitives such as preferences and beliefs. I review strong biological and behavioral evidence indicating that trusting is not just a special case of risk-taking, but based on important forms of social preferences such as betrayal aversion. Behaviorally defined trust also opens the door for understanding national and ethnic trust differences in terms of differences in preferences and beliefs, and it suggests ways to examine and interpret a causal role of trust.trust, preferences, beliefs, biological basis

On Inequity Aversion - A Reply to Binmore and Shaked

In this paper we reply to Binmore and Shaked’s criticism of the Fehr-Schmidt model of inequity aversion. We put the theory and their arguments into perspective and show that their criticism is not substantiated. Finally, we briefly comment on the main challenges for future research on social preferences

Theories of Fairness and Reciprocity

Most economic models are based on the self-interest hypothesis that assumes that all people are exclusively motivated by their material self-interest. In recent years experimental economists have gathered overwhelming evidence that systematically refutes the self-interest hypothesis and suggests that many people are strongly motivated by concerns for fairness and reciprocity. Moreover, several theoretical papers have been written showing that the observed phenomena can be explained in a rigorous and tractable manner. These theories in turn induced a new wave of experimental research offering additional exciting insights into the nature of preferences and into the relative performance of competing theories of fairness. The purpose of this paper is to review these recent developments, to point out open questions, and to suggest avenues for future research

Social norms and human cooperation

The existence of social norms is one of the big unsolved problems in social cognitive science. Although no other concept is invoked more frequently in the social sciences, we still know little about how social norms are formed, the forces determining their content, and the cognitive and emotional requirements that enable a species to establish and enforce social norms. In recent years, there has been substantial progress, however, on how cooperation norms are enforced. Here we review evidence showing that sanctions are decisive for norm enforcement, and that they are largely driven by nonselfish motives. Moreover, the explicit study of sanctioning behavior provides instruments for measuring social norms and has also led to deeper insights into the proximate and ultimate forces behind human cooperation.Social Norms, Cooperation, Punishment, Reciprocity

How Robust are Nominal Wage Rigidities?

Several studies indicate that firms are reluctant to cut nominal wages during periods of relatively high nominal per capita GDP growth. It has been argued, however, that in an environment with a low nominal per capita GDP growth, i.e., when nominal wage cuts become customary, firms would no longer hesitate to cut nominal pay. To examine this argument we use data from Switzerland where nominal GDP growth has been very low between 1991 and 1997. It turns out that the rigidity of nominal wages is a robust phenomenon that does not vanish but even increases as inflation decreases. Nominal wage rigidity constitutes a considerable obstacle to real wage adjustments. Our estimates indicate that wage rigidity is almost complete for full-time workers who stay with the same employer, but we find little evidence of nominal rigidities for workers who switch employers. We also find evidence that, in the absence of downward nominal rigidity, real wages would indeed be quite responsive to unemployment.

The Incidence of an Extended Ace Corporation Tax

This paper deals with the efficiency and distributional consequences of a switch from the current German income and corporate tax system to one special variant of an intertemporally neutral tax, an extended ACE (allowance for corporate equity) corporation tax. This tax is favoured by the IFS Capital Taxes Group and was implemented in Croatia in 1994. We not only calculate the welfare consequences of introducing the ACE, but also separate the efficiency effects from intragenerational as well as intergenerational redistribution. The quantitative analysis is based on a dynamic simulation model of the Auerbach-Kotlikoff type which distinguishes between five income classes within each generation. The numerical results indicate that such a fundamental tax reform could yield enormous efficiency gains without necessarily increasing income inequality.Corporate taxation, intra- and intergenerational incidence, dynamic CGE modeling

Reputation and Credit Market Formation: How Relational Incentives and Legal Contract Enforcement Interact

The evidence suggests that relational contracting and legal rules play an important role in credit markets but on the basis of the prevailing field data it is difficult to pin down their causal impact. Here we show experimentally that relational incentives are a powerful causal determinant for the existence and performance of credit markets. In fact, in the absence of legal enforcement and reputation formation opportunities the credit market breaks down almost completely while if reputation formation is possible a stable credit market emerges even in the absence of legal enforcement of debt repayment. Introducing legal enforcement of repayments causes a further significant increase in credit market trading but has only a surprisingly small impact on overall efficiency. The reason is that legal enforcement of debt repayments weakens relational incentives and exacerbates another moral hazard problem in credit markets – the choice of inefficient high-risk projects.credit markets, relationship lending, reputation formation, legal enforcement