Seemingly altruistic behavior: selfish genes or cooperative organisms?

A largely unrecognized agency problem is embedded in Dawkins’s selfish gene theory, which treats an organism as an agent of its genes; the economic view of this problem is brought to bear on the theory and is used to offer an explanation of the correlation between altruistic behavior and biological closeness of interacting organisms that differs from that given by selfish gene theory. The essay also discusses differences between empirical implications of selfish gene theory and those of a reciprocity theory of seemingly altruistic behavior.     

Optimal contracting with altruism and reciprocity

Motivated by the recent experimental evidence on altruistic behavior, we study a simple principal–agent model where each player cares about other players' utility, and may reciprocate their attitude towards him. We show that, relative to the selfish benchmark, efficiency improves when players are altruistic. Nevertheless, in contrast to what may be expected, an increase in the degree of the agent's altruism as well as a more reciprocal behavior by players has ambiguous effects on efficiency. We also consider the effects of the presence of spiteful players and discuss how monetary transfers between players depend on their degrees of altruism and spitefulness.     

ALTRUISM AND BENEFIT-COST ANALYSIS*

The central theoretical achievement of classical and neoclassical economics is the demonstration, summed up by Adam Smiths metaphor of the invisible hand, that the interaction of selfish economic agents may produce a mutually beneficial, and Pareto-optimal outcome. The assumption that economic agents are selfish has been criticised both as empirically inaccurate (Margolis, 1982; Quiggin, 1987) and as likely to generate anti-social attitudes in those who hold it (Marwell and Ames, 1981). There has, therefore, been considerable interest in economic behaviour and policy analysis when agents are altruistic.     

Long‐term care policy with lazy rotten kids

This paper studies the determination of informal long‐term care (LTC) provided by children in a scenario which is somewhere in between perfect altruism and selfish exchanges. Parents are altruistic but children are purely selfish, and neither side can make credible commitments. The model is based on Becker's “rotten kid” specification except that it explicitly accounts for the sequence of decisions. In Becker's world, with a single good efficiency is achieved. We show that when family aid is introduced the outcome is likely to be inefficient. Still, the rotten kid mechanism is at work and ensures that a positive level of LTC is provided as long as the bequest motive is operative. We identify the inefficiencies by comparing the laissez‐faire (subgame perfect) equilibrium to the first‐best allocation. We first assume that families are identical ex ante and then consider the case where dynasties differ in wealth. We study how the provision of LTC can be improved by public policies. Interestingly, crowding out of private aid by public LTC is not a problem in this setting. With an operative bequest motive, public LTC will have no impact on private aid. More amazingly still, when the bequest motive is (initially) not operative, public insurance may even enhance the provision of informal aid.     

Contracts without memory in multiperiod agency models

Settings are considered in which optimal multiperiod contracts can have no memory, i.e., where second period payments do not need to depend on first period outcomes. If contracts have no memory, a repeated agency game can be played myopically; there are no gains to long-term relationships. Conditions on preferences for a no memory contract are presented. In an agency game with moral hazard on the act selection, preference separability and domain additivity imply the existence of a no memory contract. In a setting without moral hazard but with asymmetric information on the outcome, domain additivity implies no memory.     

Behavioral Mechanism Design

This paper studies the mechanism design problem for the class of Bayesian environments where agents do care for the well‐being of others. For these environments, we fully characterize interim efficient (IE) mechanisms and examine their properties. This set of mechanisms is compelling, since IE mechanisms are the best in the sense that there is no other mechanism which generates unanimous improvement. For public good environments, we show that these mechanisms produce public goods closer to the efficient level of production as the degree of altruism in the preferences increases. For private good environments, we show that altruistic agents trade more often than selfish agents.     

Incentive Contracts for Natura 2000 Implementation in Forest Areas

The implementation of nature conservation policy is often based on contracts between public authorities and landowners. In this article, we model incentive contracts in forest areas in the presence of adverse selection and moral hazard when the conservation outcome is uncertain ex ante but observable ex post. The results show that agents who are likely to achieve a higher level of conservation should be offered a contract where transfers depend on the final outcome, with a bonus for a high ecological level of the forest. When conservation measures are correlated with forest management, we show that the contractual measures involve distorted transfers. We analyse the payment mechanisms used in France and Denmark in the context of the Natura 2000 policy. These mechanisms result in overcompensation and under-performance since they do not take the problem of moral hazard and natural variability into account.     

Ethics,welfare, and capital markets

We examine implications of a society's cultural emphasis on moral sentiments. Entrepreneurs and investors interact in a game that entails both adverse selection and moral hazard; entrepreneurs may attempt to breach their contracts and expropriate investors. An agent is born into a particular culture but chooses whether to develop a moral conscience and thereby subject himself to moral sentiments. In equilibrium, societies that place less emphasis on guilt exhibit a lower risk of expropriation in contracts, a greater net price of capital, a larger size of firms, increased capital inflows and greater social welfare. The results of a greater emphasis on pride are in the same direction.     

Explicit versus implicit contracts for dividing the benefits of cooperation

Experimental evidence has accumulated highlighting the limitations of formal and explicit contracts in certain situations, and has identified environments in which informal and implicit contracts are more efficient. This paper documents the superior performance of explicit over implicit contracts in a new partnership environment in which both contracting parties must incur effort to generate a joint surplus, and one (“strong”) agent controls the surplus division. In the treatment in which the strong agent makes a non-binding, cheap talk “bonus” offer to the weak agent, this unenforceable promise doubles the rate of joint high effort compared to a baseline with no promise. The strong agents most frequently offered to split the gains of the high effort equally, but actually delivered this amount only about one-quarter of the time. An explicit and enforceable contract offer performs substantially better, increasing the frequency of the most efficient outcome by over 200% relative to the baseline.     

Optimal contract mechanisms for principal-agent problems with moral hazard and adverse selection

Summary We examine the problem of incentive compatibility and mechanism design for incomplete information principal-agent problems. Allowing for risk aversion on the part of the principal and agent, we show the existence of an optimal, incentive compatible contract selection mechanism for the principal under conditions of moral hazard and adverse selection. Since we assume that the contract set is a function space of state contingent contracts, and that the set of agent types is uncountable, the set of contract selection mechanisms becomes infinite dimensional. Hence, novel existence arguments are required. Our existence result extends those of Grossman and Hart [10] and Page [23] to an infinite dimensional setting with incomplete information.     

Freedom, enforcement, and the social dilemma of strong altruism

Cooperation in joint enterprises poses a social dilemma. How can altruistic behavior be sustained if selfish alternatives provide a higher payoff? This social dilemma can be overcome by the threat of sanctions. But a sanctioning system is itself a public good and poses a second-order social dilemma. In this paper, we show by means of deterministic and stochastic evolutionary game theory that imitation-driven evolution can lead to the emergence of cooperation based on punishment, provided the participation in the joint enterprise is not compulsory. This surprising result—cooperation can be enforced if participation is voluntary—holds even in the case of ‘strong altruism’, when the benefits of a player’s contribution are reaped by the other participants only.     

Renegotiation-Proof Dynamic Contracts with Private Information

This paper studies the issue of renegotiation in a model of dynamic moral hazard. I introduce the notion of a renegotiation-proof dynamic contract. I show that the constraint of renegotiation-proofness can have the effect of setting a higher lower bound to the set of attainable expected utilities of the agent. This result extends the notion of “credit rationing” from the static models of optimal contracting to a dynamic setting and is useful for thinking about competition for long-term contracts. This result also has implications for the long-run behavior of the expected utility of the agent under dynamic contracting. Journal of Economic Literature Classification Numbers: 026, 315.     

Trading for the future: Signaling in permit markets

Permit markets are celebrated as a policy instrument since they allow (i) firms to equalize marginal costs through trade and (ii) the regulator to distribute the burden in a politically desirable way. These two concerns, however, may conflict in a dynamic setting. Anticipating the regulator's future desire to give more permits to firms that appear to need them, firms purchase permits to signal their need. This raises the price above marginal costs and the market becomes inefficient. If the social cost of pollution is high and the government intervenes frequently in the market, the distortions are greater than the gains from trade and non-tradable permits are better. The analysis helps to understand permit markets and how they should be designed.     

A 4D natural selection model illuminates the enigma of altruism in the Shedao pit viper

Endemic to a small island off the coast of China, the Shedao pit viper, Gloydius shedaoensis, is known for its ‘accidental altruism.’ Juvenile pit vipers often kill passerine birds too large to swallow. Large prey carcasses are scavenged by neighboring adults. In turn, adult pit vipers kill hawks that prey on juvenile pit-vipers, but are not a threat to the adults themselves. Using agent-based computer simulations, we quantified the lifetime fitness of pit viper breeders with one of three genotypes: selfish, altruistic or both selfish and altruistic. Our simulation was based on a four-dimensional (4D) model of social behavior which included interactions of pit viper offspring with predators and prey as well as conspecifics. Results showed that, over ten breeding seasons, pit viper breeders with flexible altruistic and selfish genotypes averaged seven times the number of surviving offspring relative to breeders with pure-selfish genotypes, and 23 times the number of surviving offspring as breeders with pure-altruistic genotypes. In summary, viewing animal behavior through the lens of the 4D model will extend our understanding of the evolutionary pathway to social behaviors through natural selection processes.     

Pessimistic information gathering

An agent gathers information on productivity shocks and accordingly produces on behalf of a principal. Information gathering is imperfect and whether it succeeds or not depends on the agent's effort. Contracting frictions come from the fact that the agent is pessimistic on the issue of information gathering, and there are both moral hazard in information gathering, private information on productivity shocks and moral hazard on operating effort. An optimal menu of linear contracts mixes high-powered, productivity-dependent screening options following “good news” with a fixed low-powered option otherwise.     

When vagueness induces indirect competition: strategic incompleteness of contracts

Summary. A class of employment contracts entailing production targets and consequent rewards is studied. In a nondiscriminatory environment, a principal hiring many agents faces the problem of writing a common contract which induces the highest possible effort from each one of his agents. While a very high target may get the best out of highly skilled agents, low skilled ones tend to shirk. On the other hand, although low targets make every agent put positive effort, there are efficiency losses from the high skilled agents. Also, in such environments the principal often has better information regarding the skills of all his agents than what each agent has regarding the rest of the agents at work. We show that if skills of agents are sufficiently close, the informed principal earns strictly higher profits by offering incomplete contracts as against being specific, as incomplete contracts reduce flow of information and induce indirect competition amongst agents. Received: May 19, 2000; revised version: August 28, 2001     

Optimal incentive contracts with multiple agents

A setting in which a single principal contracts with two agents who possess perfect private information about their own productivity is considered. With correlated productivities, each agent's private information also provides a signal about the other agent's productivity. In contrast to the setting in which there is only one agent, it is shown that such private information may be of no value to the agents. It is only if the agents are risk-averse that their private information may allow them to command rents. Moreover, when the agents are constrained only to reveal their private information truthfully as a Nash equilibrium, the Pareto optimal incentive scheme may induce the agents to adopt strategies other than truth-telling. This leads to the consideration of truth-telling equilibria that are not Pareto dominated in the subgame played by the agents. Among all such equilibria, the one preferred by the principal restricts one agent to tell the truth as a dominant strategy and the other as a Nash response to truth.     

MIMICKING THE WINNER LEADS TO WAR: AN EVOLUTIONARY ANALYSIS OF CONFLICT AND COOPERATION*

This note applies an evolutionary analysis to Skaperdas's (1992) static model of conflict and cooperation, in which agents are faced with trade‐offs between joint production and share competition. We adopt the stochastic evolution approach, and assume that each agent occasionally mimics the action of the winner of the stage. In contrast to Skaperdas's results that justify full or partial cooperation in productive activity, the long‐run equilibrium must exhibit total conflict; nobody engages in production at all.     

Intermediation by aid agencies

This paper models aid agencies as financial intermediaries that do not make a financial return to depositors, whose concern is to transfer resources to investor-beneficiaries. This leads to a problem of verifying that the agency is using donations as intended. One solution to this problem is for an agency to employ altruistic workers at below-market wages: altruistic workers, who can monitor the agency's activities, would not work at below-market rates unless they were genuinely transferring resources to beneficiaries. We consider conditions for this solution to be incentive compatible. In a model with pure moral hazard, observability of wages makes incorporation as a not-for-profit firm redundant as a commitment device. In a model with both moral hazard and adverse selection, incorporation as a not-for-profit firm can serve as a costly commitment mechanism reassuring donors against misuse of their funds. Hiring a worker of low ability can also be a valuable commitment device against fraud.