Sören Harrs

We experimentally study competitive markets with socially responsible production. Our main focus is on the producers' decision whether or not to reveal the degree of social responsibility of their product. Compared to two benchmark cases where either full transparency is enforced or no disclosure is possible, we show that voluntary and costless disclosure comes close to the full transparency benchmark. However, when the informational content of disclosure is imperfect, social responsibility in the market is significantly lower than under full transparency. Our results highlight an important role for transparent and standardized information about social externalities.

Can voluntary contributions to public goods be motivated by identity concerns? In a theory-driven field experiment we test how positive and negative shocks to subjects’ environmental identity beliefs affect voluntary efforts for climate protection. In a real-effort task, subjects can generate donations that off-set carbon emissions. Prior to the task, we manipulate subjects’ beliefs about their environmental identity either positively or negatively compared to a control group. A negative shock to identity (“identity threat”) increases effort by about 17% compared to our control group. This effect is largest for subjects that had a strong prior environmental identity belief. We find no evidence that a positive shock to identity does affect behavior. Our results are in line with some of the main predictions from the belief-based model of identity by Bénabou and Tirole (2011). They also have implications for policy makers and NGOs that want to encourage voluntary contributions to climate protection by leveraging people’s identity concerns.

The provision of information is a powerful way to influence economic decisions.  Standard theory, along with a recent empirical literature, explains the persuasiveness of information provision with its effects on people's beliefs and expectations. In this paper, we provide experimental evidence that information can influence economic decisions through a second mechanism: through short-term effects on people's risk and time preferences. In an information provision experiment in the context of the coronavirus pandemic, subjects read news articles that contain either an optimistic, a pessimistic, or a balanced narrative about the exogenous shock of the pandemic. Reading a more pessimistic narrative leads to more pessimistic expectations about the pandemic and the stock market. However, reading a more pessimistic narrative also increases subjects' risk aversion and reduces their patience in incentivized experimental games by 30\% to 40\% of a standard deviation. Our findings suggest that information presented as narratives can influence economic decision-making through short-term changes in people's economic preferences. 

In 2014 Indian Prime Minister Narendra Modi launched the Clean India Campaign, one of the largest social norm campaigns in the country's history. In order to change prevailing habits of littering and open defecation, the campaign frequently refers to Indian national identity and emphasizes patriotism. This paper first presents a theoretical framework discussing the role of identity in social norm interventions. Second, it provides empirical evidence from a field experiment at cigarette shops in Bangalore, India. Treated subjects see anti-littering signs that prescribe behavior for one specific identity. Identity norm messages that prescribe behavior for the Indian national identity or the local Bangalorean identity reduce littering by 15.5pp and 21.9pp respectively compared to conventional anti-littering messages. The experiment provides evidence that appealing to people's identity can be an effective intervention for promoting behavior change.