The identifiable victim effect in charitable giving: evidence from a natural field experiment

We design a natural field experiment to enhance our understanding of the role of the identifiable victim effect in charitable giving. Using direct mail solicitations to 25 797 prior donors of a nonprofit charity, we tested the responsiveness of donors to make a contribution to either an identifiable or a statistical victim. Unlike much previous research, which has used only laboratory experiments, we find that the campaign letter focusing on one identifiable victim did not result in significantly larger donations than the campaign letter focusing on the statistical victim. In addition to the role of the identifiable victim, we investigate the degree to which each of our campaign letters affected donors’ payments to other concurrent and future campaigns and whether there is decreasing marginal returns to campaigning in the sense that receiving a letter crowds out donors’ payments to other future and concurrent campaigns. We find some evidence of crowding out, indicating that charitable giving could be a zero-sum game; however, the treatment letters did not have different effects on other payments.     

Hidden benefits of reward: A field experiment on motivation and monetary incentives

We conducted a field experiment in a controlled work environment to investigate the effect of motivational talk and its interaction with monetary incentives. We find that motivational talk improves performance only when accompanied by performance pay. Moreover, performance pay reduces performance unless it is accompanied by motivational talk. These effects also carry over to the quality of work. Performance pay alone leads to more mistakes. Adding motivational talk makes the difference. In treatments with performance pay, motivational talk increases output by about 20 percent and reduces the ratio of mistakes by more than 40 percent.     

Performance pay and worker cooperation: Evidence from an artefactual field experiment

We report the results of an artefactual field experiment with bicycle messengers in Switzerland and the United States. Messenger work is individualized enough that firms can choose to condition pay on it, but significant externalities in messenger behavior nonetheless give their on-the-job interactions the character of a social dilemma. Second-mover behavior in our sequential prisoner's dilemma allows us to characterize the cooperativeness of our participants. Among messengers, we find that employees at firms that pay for performance are significantly less cooperative than those at firms that pay hourly wages or who are members of cooperatives. To examine whether the difference is the result of treatment or selection we exploit the fact that firm type is location-specific in Switzerland and that entering messengers must work in performance pay firms in the U.S.     

Employment discrimination in a former Soviet Union Republic: Evidence from a field experiment

We provide the first experimental evidence about ethnic and gender discrimination in the labor market of a former Soviet Union country, Georgia. We randomly assign Georgian and non-Georgian, male and female, names to similar resumes and apply for jobs as advertised on help-wanted websites in Georgia. We find that gender has no effect on the probability of callback, but a job applicant who is ethnically Georgian is more than twice as likely to be called for a job interview than an equally skilled ethnic non-Georgian (Azerbaijani or Armenian). The 113% ethnic gap in callbacks (167% among males and 79% among females), which is substantially larger than the gap typically documented in the existing literature for both developed and developing countries, is statistically significant and cannot be abridged by having more experience or education. There is no evidence of gender discrimination in callbacks, both within the Georgian group and the non-Georgian group.     

Reducing ambiguity in lotteries: evidence from a field experiment

Ambiguity about the chances of winning represents a key aspect in lotteries. By means of a controlled field experiment, we exogenously vary the degree of ambiguity about the winning chances of lotteries organized to incentivize the contribution for a public good. In one treatment, people have been simply informed about the maximum number of potential participants (i.e. the number of lottery tickets released). In a second treatment, this information has been omitted as in all traditional lotteries. Our general finding shows that simply reducing the degree of ambiguity of the lottery leads to a sizable and significant increase (67%) in the participation rate. This result is robust to alternative prize configurations.     

Does an economic incentive affect provider behavior? Evidence from a field experiment on different payment mechanisms

Aims: This study analyzed discrepancies in the quantity of medical services supplied by physicians under different payment systems for patients with different health statuses and illnesses by means of a field experiment.

Methods: Based on the laboratory experiment of Heike Hennig-Schmidt, we designed a field experiment to examine fee-for-service (FFS), capitation (CAP), and diagnosis-related group (DRG) payment systems. Medical students were replaced with 220 physicians as experimental subjects, which more closely reflected the clinical choices made by physicians in the real world. Under the three payment mechanisms, the quantity of medical services provided by physicians when they treated patients with different health statuses and illnesses were collected. Finally, relevant statistics were computed and analyzed.

Results: It was found that payment systems (sig. = 0.000) and patient health status (sig. = 0.000) had a stronger effect on physicians’ choices regarding quantity of medical services than illness types (sig. = 0.793). Additionally, under the FFS and CAP payment systems, physicians overserved patients in good and intermediate health while underserving patients in bad health. Under the DRG payment system, physicians overserved patients in good health and underserved patients in intermediate and bad health. Correspondingly, under FFS and CAP, the proportional loss of benefits was the highest for patients in bad health and the lowest for patients in good and intermediate health; while under DRGs, patients in good and intermediate health had the largest and smallest loss of benefits, respectively.

Limitations: In order to increase external effects of experiment results, we used the field experiment to replace laboratory experiment. However, the external effects still existed because of the blurring and abstraction of the parameters.

Conclusions: Medical treatment cost and price affected the quantity of medical services provided by physicians. Therefore, we proposed that a mix of payment systems could address the common interests of physicians and patients, as well as influence incentives from payment systems.     

The effects of group composition in a strategic environment: Evidence from a field experiment

Recent theoretical and empirical studies have explored the effect of group membership and identity on individual decision-making. This line of research highlights that economic models focusing on the individual as the sole entity in the decision-making environment potentially miss critical features. This study takes this literature in a new direction by overlaying a field experiment onto a setting where groups have arisen naturally. Our experimental laboratory is large open air markets, where we are able to examine the effects of group membership on seller׳s collusive behavior as measured by prices and surplus allocations. This permits us to explore strategic implications of group composition. Empirical results illustrate the importance of group composition on pricing decisions, and show that deviations from Nash equilibrium are crucially related to group membership.     

Corruption and privatization: Evidence from a natural experiment in China

This paper investigates how government corruption shapes state-owned enterprises' (SOEs) privatization. To establish causality, we exploit a natural experiment (i.e., the investigations of the Central Commission for Discipline Inspection) to document that SOEs significantly deepen privatization after the crackdown on corruption. Further evidence demonstrates two plausible mechanisms driving our findings. Specifically, anti-corruption campaign: 1) accelerates privatization process by curbing the underpricing transfers to state entities and encouraging the normal transfers to private entities or individuals; and 2) by reducing managers' incentives to maintain the dominance of state ownership for expropriation through the discretion of perk consumption. Moreover, our findings are particularly pronounced for SOEs located in areas with high levels of social trust, government intervention, and less information asymmetry.     

Premium subsidies and demand for private health insurance: results from a regression discontinuity design

This article investigates the impact of a private health insurance (PHI) subsidy on the demand for PHI in the context of the Australian health care system. In particular, we focus on the subpopulation of elderly Australians and exploit discontinuous increases to the universal ‘PHI rebate’ that occur when people turn 65 and 70 years. Using a regression discontinuity design, we find the policy has little effect on take-up of PHI and is best interpreted as a wealth transfer to elderly Australians who already have insurance.     

Envy and the Islamic revival: Experimental evidence from Tunisia

I design and conduct a survey with an embedded lab-in-the-field experiment to test whether envy triggers popular support for the Islamic revival using a nationally representative sample of 600 Tunisians. Individuals exposed to high inequality may feel envious if they perceive that the success of others is granted rather than earned. Thus, envious individuals may be motivated to engage in religious and political activities to cope with their feelings. I trigger the sentiment of envy with a 2 ?×? 2 design by interacting a priming video and low stakes. I find that individuals in the envy treatment donate a larger proportion of their endowment to a politically involved religious charity, my measure of support for the Islamic revival. Overall, my experimental findings, consistent with survey data, confirm the idea that envy is an important determinant of popular support for the Islamic revival, even after controlling for religiosity.     

Price clustering and natural resistance points in the Dutch stock market: A natural experiment

This paper focuses on the tendency of stock prices to cluster at round numbers (like 10, 20, 30, etc. and to a lesser extent 5, 15, 25, etc.) and the related effect of round number price barriers (prices pass round numbers less frequently than other numbers). Two competing hypotheses are tested, using data from the Dutch stock market of the period 1990–2001. After 1 January 1999 stock prices were listed in euros, while guilders were still the currency of daily life until 2002. The aspiration level hypothesis predicts that round number effects in guilders will only slowly disappear. The odd price hypothesis predicts an abrupt change in round number effects after 1 January 1999. Generally, the results are consistent with the odd price hypothesis.     

File sharing as conditional cooperation: evidence from a framed field experiment

In this project, we investigate downloading and sharing behaviour in a novel ‘piracy game’ modelled after standard public good games. We find that willingness to share correlates positively with the sharing by others. By contrast, actual behaviour in the ‘piracy game’ is not correlated with self-reported behaviour.     

Education and income attraction: an online dating field experiment

Prior studies have found a robust correlation in the education of dating and married couples. However, there is little evidence to suggest that such correlations are causal, that is, for the sake of relationship public goods such as the pleasures of the enlightened conversations that only a common high level of education might support. Being empirical studies, they cannot rule out couples matching on other characteristics like income, height or health, which are correlated with education, from driving results. We contribute to this literature by randomly assigning high and low education and income levels to 388 artificial male and female profiles on a large online dating website in China. We then counted thousands of ‘visits’ – clicks on abbreviated profiles, which included education and income information, from search engine results. We found that men’s visits to female profiles were unaffected by the profile’s assigned education level, while women’s visits to male profiles increase with the profile’s education. However, that increase was not increasing on the women’s own level of education, though their visits to the higher income male profiles was increasing on their own education. Our findings suggest that the relationship public goods that stem from a common level of high education are not at the forefront of either men’s or women’s minds before their first dates, when one might expect such goods to play a critical role in the decision to develop the relationship further.     

绿色研发补贴与绿色技术创新 ———迎合视角的异质效应检验

绿色研发补贴是指中央或地方政府鼓励企业从事节约资源和保护环境等绿色技术创新活动的财政补贴。本文以企业的迎合行为为视角,基于中国上市公司2011—2020年的面板数据,采用双向固定效应模型实证检验了绿色研发补贴对绿色技术创新数量和质量的激励效应。研究发现：(1)绿色研发补贴能促进企业绿色技术创新;(2)绿色研发补贴对绿色技术创新激励存在异质效应,表现为对绿色技术创新数量的促进作用优于质量;(3)企业对绿色研发补贴存在迎合行为,这导致绿色研发补贴产生“强数量、弱质量”的激励异质效应;(4)绿色研发补贴的激励异质效应受到行业污染程度和环境规制强度的差异影响,表现为相较于重污染行业,绿色研发补贴对非重污染行业的激励效果更优,但迎合行为的存在也会导致“强数量、弱质量”的激励效应;环境规制强的地区绿色研发补贴能促进企业绿色技术创新“增量提质”,表明强规制能制约企业策略性创新的迎合行为。本文研究不仅深化了绿色研发补贴的量化研究,而且识别并检验了迎合行为的扭曲效应,为完善绿色研发补贴标准的制定和发放以及推动企业高质量绿色技术创新提供了微观经验支撑和对策建议。     

Paying the price of sweetening your donation: Evidence from a natural field experiment

We add a gift in appreciation of the subject’s contribution to a social reference treatment successfully proven to trigger higher donations, and find that the share of people contributing decreases significantly, thereby eroding the original treatment’s capacity to increase donations.     

Race and gender effects on employer interest in job applicants: new evidence from a resume field experiment

We sent nearly 9000 fictitious resumes to advertisements for job openings in seven major cities in the United States across six occupational categories. We randomly assigned names to the resumes that convey race and gender but for which a strong socio-economic connotation is not implicated. We find little evidence of systematic employer preferences for applicants from particular race and gender groups.     

Matching mechanisms and matching quality: Evidence from a top university in China

We compare competing college admission matching mechanisms that differ in preference submission timing (pre-exam, post-exam but pre-score, or post-score) and in matching procedure (Boston (BOS) and serial dictatorship (SD) matching). Pre-exam submission asks students to submit college preferences before entrance exam scores are known, whereas post-score (post-exam) submission removes (reduces) score uncertainties. Theoretical analyses show that although mechanisms with post-score submission or SD matching are ex-post fair and efficient, they are not so ex-ante. Instead, the mechanism with pre-exam submission and BOS matching can be more fair and efficient ex-ante. These hypotheses are supported by empirical test on data from a top school at a top-ranked Chinese university with identification based on temporal and provincial changes. We find that although students admitted under the pre-exam BOS mechanism have lower college entrance exam scores than students admitted through other mechanisms on average, they exhibit similar or even better college academic performance.     

Effects of a holiday trip on health and quality of life: evidence from a natural experiment in South Korea

We examine whether having a holiday trip affects an individual’s well-being, namely quality of life, health status, stress level and health behaviours. We use the two-stage estimation method to control for endogeneity of a travel experience, exploiting a natural experiment of distributing Travel Vouchers at random among qualified applicants in South Korea in 2012. We find that, for applicants whose decision to travel is influenced by receiving a voucher, a travel experience has no significant effects on the traveller’s well-being measured 3–12 months later. We also find that the OLS estimates overstate benefits of a travel.     

Gift giving and worker productivity: Evidence from a firm-level experiment

We present results from a field experiment, designed to measure worker response to a monetary gift from their employer. The experiment took place inside a tree-planting firm paying its workforce incentive contracts. Firm managers told a crew of tree planters they would receive a pay raise for one day as a result of a surplus not attributable to past planting productivity. We compare planter productivity—the number of trees planted per day—on the day the gift was handed out with productivity on previous and subsequent days of planting on the same block, and thus under similar planting conditions. We find direct evidence that the gift had a significant and positive effect on daily planter productivity, controlling for planter-fixed effects, weather conditions and other random daily shocks.     

Tuition fees and social segregation: lessons from a natural experiment at the University of Paris 9-Dauphine

Using a natural experiment, a sharp rise in tuition fees in some of the programmes at the University of Paris 9-Dauphine, we study the impact of tuition fees on students’ pathways, and outcomes. We apply an optimal matching method to the national database of students’ registrations (SISE) to define a typology of pathways. We then use a nonordered multinomial logit model to evaluate the impact of the rise in tuition fees on the types of pathways selected by the university. We show that there is a significant impact on these pathways. The increase in tuition fees reduces geographic and social mobility, thereby accentuating the phenomena of social segregation. Furthermore, contrary to what some of the studies assert, the rise does not appear to encourage greater effort: we find no impact on the graduation success rate.