Discussion Paper No. 504
May 23, 2024
Principled Mechanism Design with Evidence
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Abstract:
We cast mechanism design with evidence in the framework of Myerson (1982), whereby his generalized revelation principle directly applies and yields standard notions of incentive compatible direct mechanisms. Their specific nature depends on whether the agent's (verifiable) presentation of evidence is contractually controllable, however. For deterministic implementation, we show that, in general, such control has value, and we offer two independent conditions under which this value vanishes, one on evidence (WET) and another on preferences (TIWO). Allowing for fully stochastic mechanisms, we also show how randomization generally has value and clarify to what extent this value vanishes under the common assumption of evidentiary normality (NOR). While, in general, the value of control extends to stochastic implementation, neither control nor randomization have any value if NOR holds together with WET or TIWO.
Keywords:
mechanism design; revelation principle; evidence; verifiable information; value of control; value of randomization;
JEL-Classification:
D82;
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Discussion Paper No. 479
December 13, 2023
Do We Talk Too Much?
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We consider the trade-off between talking and listening in a laboratory experiment where two team members need to coordinate on the use of an information channel. Each team member indicates their preference to “talk” and share her own information with her teammate, or to “listen” and obtain knowledge of the teammate’s information. The nature of the information varies across treatments. For stylized urns-and-balls treatments, we formalize a version of the “hard-easy effect” of over- and under-confidence: players talk more in situations where information is relatively precise – not only for the talker but also for the listener. Indeed we find that a more precise information structure induces a higher talking frequency, with a difference of 5 percentage points, relative to a baseline of 48 percent. The game-theoretic equilibrium, with rational expectations, predicts no such treatment effect. In treatments where information arises from real-world contexts, the hard-easy effect on the talking frequency is even stronger, at about 13 percentage points, relative to a baseline of about 38 percent.
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Discussion Paper No. 478
Public Appeals and Collective Crisis Mitigation
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Arrivals of crises often trigger public appeals by policy leaders, attempting to motivate crisis-mitigating behaviors. We run a controlled experiment among a general-population sample to investigate the impact of such appeals and of their tonality. Varying the language, an identical content of the appeal—a plea to contribute to mitigating a crisis—is formulated with either positive or negative wordings. Relative to the case with no appeal, both types of appeals successfully raise contributions, each by about 20 percent. A separate sample of policy-makers is presented with our design and asked to estimate the effect of the appeals. They correctly predict the effect of the positively worded appeal but fail to predict the effect of the negatively worded one.
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Discussion Paper No. 477
Attempting to Detect a Lie: Do We Think it Through?
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Game-theoretic analyses of communication rely on beliefs – especially, the receiver’s belief about the truth status of an utterance and the sender’s belief about the reaction to the utterance – but research that provides measurements of such beliefs is still in its infancy. Our experiment examines the use of second-order beliefs, measuring belief hierarchies regarding a message that may be a lie. In a two-player communication game between a sender and a receiver, the sender knows the state of the world and has a transparent incentive to deceive the receiver. The receiver chooses a binary reaction. For a wide set of non-equilibrium beliefs, the reaction and the receiver’s second-order belief should dissonate: she should follow the sender’s statement if and only if she believes that the sender believes that she does not follow the statement. The opposite is true empirically, constituting a new pattern of inconsistency between actions and beliefs.
Keywords:
strategic information transmission; lying; higher-order beliefs;
JEL-Classification:
D01; D83;
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Discussion Paper No. 463
November 24, 2023
Robust Decision-Making under Risk and Ambiguity
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Economists often estimate economic models on data and use the point estimates as a stand-in for the truth when studying the model’s implications for optimal decision-making. This practice ignores model ambiguity, exposes the decision problem to misspecification, and ultimately leads to post-decision disappointment. Using statistical decision theory, we develop a framework to explore, evaluate, and optimize robust decision rules that explicitly account for estimation uncertainty. We show how to operationalize our analysis by studying robust decisions in a stochastic dynamic investment model in which a decision-maker directly accounts for uncertainty in the model’s transition dynamics.
Keywords:
decision-making under uncertainty; robust Markov decision process;
JEL-Classification:
D81; C44; D25;
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Discussion Paper No. 457
November 21, 2023
Promotion Prospects and Within-level Wage Growth: A Decomposition of the Part-time Penalty for Women
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I study the life-cycle pattern of part-time employment and its impact on wage growth in female careers. I show that the part-time wage penalty consists of two essential components: i) a penalty for promotions and ii) a within-career-level wage penalty. Using dynamic structural modeling, I quantify the relative importance of the channels. The penalty for working half a day for two consecutive years in one's early thirties is one Euro per hour. 70% of it is due to slowdowns in experience accumulation within career levels. A part-time spell of four years marks the point at which forgone chances of promotion and within-level wage losses contribute to the wage penalty to an equal degree. Counterfactual simulations demonstrate that financial incentives to increase the time spent working can be well complemented by policies which ensure that experienced young women are promoted early in their careers.
Keywords:
wage growth; female labor supply; part-time employment; promotions;
JEL-Classification:
J21; J21; J24; J31;
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Discussion Paper No. 452
November 13, 2023
In-utero Exposure to Violence and Child Health in Iraq
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This paper examines the impact of exposure to violence during pregnancy on anthropometric and cognitive outcomes of children in the medium-run. I combine detailed household-level data on more than 36,000 children with geo-coded information on civilian casualties in the aftermath of the US invasion of Iraq between 2003 and 2009 and exploit within mother differences in prenatal exposure to violence. I find that one violent incident during pregnancy decreases height and weight for age scores by 0.13 standard deviations and lowers cognitive and behavioral skills of children. Leveraging information on the severity, type and perpetrator of violence, I isolate the effect of stress from access to prenatal care. I show that the results hold when restricting attention to incidents with little impact on the local infrastructure and are largest for more stressful events; primarily those that target the civilian population and involve execution and torture.
Keywords:
stress; child health; Iraq;
JEL-Classification:
I12; J13; O15;
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Discussion Paper No. 451
Chinese Aid in Africa: Attitudes and Conflict
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This study examines Chinese aid projects’ impact on conflict and perceptions of China in 820 African districts from 2000 to 2012. We show that a 10% increase in Chinese aid projects results in a 6% increase in conflict incidents. This rise is mainly due to confrontations involving non-state actors, such as militias and rebel groups, and clashes between these groups and government forces. Civilian attitudes toward China’s presence do not drive this increase, as evidenced by both revealed and stated preferences. We find that Chinese aid does not provoke protests, riots, or strikes, nor does it amplify critical views among Africans regarding Chinese culture, resource extraction, or land acquisitions. Our evidence suggests that Africans attribute the rise in conflict to the interaction of resource influx and local politics, rather than to China itself, reflecting a discerning perspective on China’s influence on the continent.
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Discussion Paper No. 411
July 28, 2023
Biased Wage Expectations and Female Labor Supply
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Wage growth occurs almost exclusively in full-time work, whereas it is close to zero in part-time work. German women, when asked to predict their own potential wage outcomes, show severely biased expectations with strong over-optimism about the returns to part-time experience. We estimate a structural life-cycle model to quantify how beliefs influence labor supply, earnings and welfare over the life cycle. The bias increases part-time employment strongly, induces flatter long-run wage profiles, and substantially influences the employment effects of a widely discussed policy reform, the introduction of joint taxation. The most significant impact of the bias appears for college-educated women.
Keywords:
returns to experience; biased beliefs; part-time work; dynamic life-cycle models; ;
JEL-Classification:
D63; H23; I24; I38; J22; J31;
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Discussion Paper No. 384
February 14, 2023
Scared Straight? Threat and Assimilation of Refugees in Germany
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This paper studies the effects of local threat on cultural and economic assimilation of refugees, exploiting plausibly exogenous variation in their allocation across German regions between 2013 and 2016. We combine novel survey data on cultural preferences and economic outcomes of refugees with corresponding information on German respondents, and construct a threat index that integrates contemporaneous and historical variables. On average, refugees assimilate both culturally and economically. However, while refugees assigned to more hostile regions converge to German culture more quickly, they do not exhibit faster economic assimilation. Our evidence suggests that refugees exert more assimilation effort in response to local threat, but that higher discrimination prevents them from integrating more quickly in more hostile regions.
Keywords:
refugees; cultural change; assimilation; identity;
JEL-Classification:
F22; J15; Z10;