Not so long ago, many economists and philosophers felt that their disciplines had no use for experimental methods. An experimental study was, by its nature, ‘not economics’ or ‘not philosophy’ – psychology maybe. Opinion has changed dramatically. This issue of Economics and Philosophy represents a collection of recent contributions to experimental research that explicitly deal with empirical findings or methodological questions in the intersection of the two disciplines. To the best of our knowledge, it is the first such collection dedicated to addressing these common interests.

We present an experiment designed to investigate three different mechanisms to achieve impartiality in distributive justice. We consider a first-person procedure, inspired by the Rawlsian veil of ignorance, and two third-party procedures, an involved spectator and a detached observer. First-person veiled stakeholders and involved spectators are affected by an initially unfair distribution that, in the stakeholders’ case, is to be redressed. We find substantial differences in the redressing task. Detached observers propose significantly fairer redistributions than veiled stakeholders or involved spectators. Risk preferences partly explain why veiled stakeholders propose less egalitarian redistributions. Surprisingly, involved spectators, who are informed about their position in society, tend to favour stakeholders holding the same position as they do after the initial distribution.

Using an economic bargaining game, we tested for the existence of two phenomena related to social norms, namely norm manipulation – the selection of an interpretation of the norm that best suits an individual – and norm evasion – the deliberate, private violation of a social norm. We found that the manipulation of a norm of fairness was characterized by a self-serving bias in beliefs about what constituted normatively acceptable behaviour, so that an individual who made an uneven bargaining offer not only genuinely believed it was fair, but also believed that recipients found it fair, even though recipients of the offer considered it to be unfair. In contrast, norm evasion operated as a highly explicit process. When they could do so without the recipient's knowledge, individuals made uneven offers despite knowing that their behaviour was unfair.

Research on moral cleansing and moral self-licensing has introduced dynamic considerations in the theory of moral behaviour. Past bad actions trigger negative feelings that make people more likely to engage in future moral behaviour to offset them. Symmetrically, past good deeds favour a positive self-perception that creates licensing effects, leading people to engage in behaviour that is less likely to be moral. In short, a deviation from a ‘normal state of being’ is balanced with a subsequent action that compensates the prior behaviour. We model the decision of an individual trying to reach the optimal level of moral self-worth over time and show that under certain conditions the optimal sequence of actions follows a regular pattern which combines good and bad actions. To explore this phenomenon we conduct an economic experiment where subjects play a sequence of giving decisions (dictator games). We find that donations in the previous period affect present decisions and the sign is negative: participants' behaviour in every round is negatively correlated to what they did in the past. Hence donations over time seem to be the result of a regular pattern of self-regulation: moral licensing (being selfish after altruistic) and cleansing (altruistic after selfish).

There is a long-standing debate in philosophy about whether it is morally permissible to harm one person in order to prevent a greater harm to others and, if not, what is the moral principle underlying the prohibition. Hypothetical moral dilemmas are used in order to probe moral intuitions. Philosophers use them to achieve a reflective equilibrium between intuitions and principles, psychologists to investigate moral decision-making processes. In the dilemmas, the harms that are traded off are almost always deaths. However, the moral principles and psychological processes are supposed to be broader than this, encompassing harms other than death. Further, if the standard pattern of intuitions is preserved in the domain of economic harm, then that would open up the possibility of studying behaviour in trolley problems using the tools of experimental economics. We report the results of two studies designed to test whether the standard patterns of intuitions are preserved when the domain and severity of harm are varied. Our findings show that the difference in moral intuitions between bystander and footbridge scenarios is replicated across different domains and levels of physical and non-physical harm, including economic harms.

Retributivist accounts of punishment maintain that it is right to punish wrongdoers, even if the punishment has no future benefits. Research in experimental economics indicates that people are willing to pay to punish defectors. A complementary line of work in social psychology suggests that people think that it is right to punish wrongdoers. This work suggests that people are retributivists about punishment. However, all of the extant work contains an important potential confound. The target of the punishment is expected to be aware of the punitive act. Thus, it's possible that people punish because they want to communicate something to the wrongdoer, e.g. disapproval, the presence of a norm, etc. In three studies, we examine whether people will punish even when the punishee will be ignorant. We find that people are no less likely to punish when the punishee will be ignorant. This finding emerges both in a survey study and in a monetized behavioural decision study.

This article is a prelude to an experimental study of the preference concept in economics. I argue that a new empirical approach called experimental philosophy of science is a promising approach to advance the philosophy of economics. In particular, I discuss two debates in the field, the neuroeconomics controversy and the commonsensible realism debate, and suggest how experimental and survey techniques can generate data that will inform these debates. Some of the likely objections from philosophers and economists are addressed, and possible ways of operationalizing different preference concepts are illustrated.