Papers - Natural

John A List, Daniel L Millimet, Thanasis Stengos

Cited by*: 32 Downloads*: 1

We explore the importance of modeling strategies when estimating the emissions-income relationship. Using U.S. state-level panel data on nitrogen oxide and sulfur dioxide emissions, we estimate several environmental Kuznets curves using the standard parametric framework as well as a more flexible semiparametric alternative. Formal statistical comparisons of the results overwhelmingly reject the parametric approach. Moreover, the differences, particularly for sulfur dioxide, are economically significant.

Orana Bandiera, Iwan Barankay, Imran Rasul

Cited by*: 4 Downloads*: 14

We document the establishment and evolution of a cooperative norm among workers using evidence from a natural field experiment on a leading UK farm. Workers are paid according to a relative incentive scheme under which increasing individual effort raises a worker's own pay but imposes a negative externality on the pay of all co-workers, thus creating a rationale for cooperation. As a counterfactual, we analyze worker behavior when workers are paid piece rates and thus have no incentive to cooperate. We find that workers cooperate more as their exposure to the relative incentive scheme increases. We also find that individual and group exposure are substitutes, namely workers who work alongside colleagues with higher exposure cooperate more. Shocks to the workforce in the form of new worker arrivals disrupt cooperation in the short term but are then quickly integrated into the norm. Individual exposure, group exposure, and the arrival of new workers have no effect on productivity when workers and paid piece rates and there is no incentive to cooperate.

Cody Cook, Rebecca Diamond, Jonathan Hall, John A List, Paul Oyer

Cited by*: 0 Downloads*: 60

The growth of the "gig" economy generates worker flexibility that, some have speculated, will favor women. We explore one facet of the gig economy by examining labor supply choices and earnings among more than a million rideshare drivers on Uber in the U.S. Perhaps most surprisingly, we find that there is a roughly 7% gender earnings gap among drivers. The uniqueness of our data - knowing exactly the production and compensation functions - permits us to completely unpack the underlying determinants of the gender earnings gap. We find that the entire gender gap is caused by three factors: experience on the platform (learning-by-doing), preferences over where/when to work, and preferences for driving speed. This suggests that, as the gig economy grows and brings more flexibility in employment, women's relatively high opportunity cost of non-paid-work time and gender-based preference differences can perpetuate a gender earnings gap even in the absence of discrimination.

Ran Kivetz, Oleg Urminsky, Yuhuang Zheng

Cited by*: None Downloads*: None

The goal-gradient hypothesis denotes the classic finding from behaviorism that animals expend more effort as they approach a reward. Building on this hypothesis, the authors generate new propositions for the human psychology of rewards. They test these propositions using a field experiment, secondary customer data, paper-and-pencil problems, and Tobit and logit models. The key finding indicate that (1) participants in a real cafe reward program purchase coffee more frequently the closer they are to earning a free coffee; (2) Internet users who rate songs in return for reward certificates visit the rating Web site more often, rate more songs per visit, and persist longer in the rating effort as they approach the reward goal; (3) the illusion of progress toward the goal induces purchase acceleration (e.g., customers who receive a 12-stamp coffee card with 2 preexisting "bonus" stamps complete the 10 required purchases faster than customers who receive a "regular" 10-stamp card) and (4) a stronger tendency to accelerate toward the goal predicts greater retention and faster reengagement in the program. The conceptualization and empirical findings are captured by a parsimonious goal distance model, in which effort investment is a function of the proportion of original distance remaining to the goal. In addition, using statistical and experimental controls, the authors rule out alternative explanations for the observed goal gradients. They discuss the theoretical significance of their findings and the managerial implications for incentive systems, promotions, and customer retention.

Craig E Landry, Andreas Lange, John A List, Michael K Price, Nicholas G Rupp

Cited by*: 3 Downloads*: 1

An important dialogue between theorists and experimentalists over the past few decades has raised the study of the interaction of psychological and economic incentives from academic curiosity to a bona fide academic field. One recent area of study within this genre that has sparked interest and debate revolves around the "hidden costs" of conditional incentives. This study overlays randomization on a naturally-occurring environment in a series of temporally-linked field experiments to advance our understanding of the economics of charity and test if such "costs" exist in the field. This approach permits us to examine why people initially give to charities, and what factors keep them committed to the cause. Several key findings emerge. First, there are hidden benefits of conditional incentives that would have gone undetected had we maintained a static theory and an experimental design that focused on short run substitution effects rather than dynamic interactions. Second, we can reject the pure altruism model of giving. Third, we find that public good provision is maximized in both the short and long run by using conditional, rather than unconditional, incentives.

Christina Gravert, Mette Trier Damgaard

Cited by*: 9 Downloads*: 63

We document the hidden costs of one of the most policy-relevant nudges, reminders. Sending reminders, while proven effective in facilitating behavior change, may come at a cost for both senders and receivers. Using a large scale field experiment with a charity, we find that reminders increase donations, but they also substantially increase unsubscriptions from the mailing list. To understand this novel finding, we develop a dynamic model of donation and unsubscription behavior with limited attention which is tested in reduced-form using a second field experiment. We also estimate our model structurally to perform a welfare analysis. We show that when not accounting for the hidden costs of reminders the average welfare effects for donors are overstated by a factor of ten and depending on the discount factor the welfare effects of the charity may be negative. Our results show the need to evaluate nudges on their intended as well as unintended consequences.

Michael Kremer, Edward Miguel

Cited by*: 7 Downloads*: 13

The history of foreign development assistance is one of movement away from addressing immediate needs and toward focusing on the underlying causes of poverty. A recent manifestation is the move towards sustainability,' which stresses community mobilization, education, and cost-recovery. This stands in contrast to the traditional economic analysis of development projects, with its focus on providing public goods and correcting externalities. We examine evidence from randomized evaluations on strategies for combating intestinal worms, which affect one in four people worldwide. Providing medicine to treat worms was extremely cost effective, although medicine must be provided twice per year indefinitely to keep children worm-free. An effort to promote sustainability by educating Kenyan schoolchildren on worm prevention was ineffective, and a mobilization' intervention from psychology failed to boost deworming drug take-up. Take-up was highly sensitive to drug cost: a small increase in cost led to an 80 percent reduction in take-up (relative to free treatment). The results suggest that, in the context we examine, the pursuit of sustainability may be an illusion, and that in the short-run, at least, external subsidies will remain necessary.

Rachel Croson, Jen Shang

Cited by*: 78 Downloads*: 34

In this paper we study the effect of downward social information in contribution decisions to fund public goods. We describe the results of a field experiment run in conjunction with the fundraising campaigns of a public radio station. Renewing members are presented with social information (information about another donor's contribution) which is either above or below their previous (last year's) contribution. We find that respondents change their contribution in the direction of the social information; increasing their contribution when the social information is above their previous contribution, and decreasing their contribution when the social information is below. We hypothesize about the psychological motivations that may cause the results and test these hypotheses by comparing the relative size of the upward and downward shifts. These results improve our understanding of cooperation in public good provision and suggest differential costs and benefits to fundraisers in providing social information.

Paul Glewwe, Albert Park, Meng Zhao

Cited by*: 2 Downloads*: 19

About 10% of primary school students in developing countries have poor vision, yet in virtually all of these countries very few children wear glasses. There has been almost no research on the impact of poor vision on school performance in developing countries, and simple OLS estimates are likely to be biased because students who study more often are likely to develop poor vision faster. This paper presents results from a randomized trial in Western China that began in the summer of 2004. The trial involves over 19,000 students in 165 schools in two counties of Gansu province. The schools were randomly divided (at the township level) into 103 schools that received eyeglasses (for students in grades 4-6) and 62 schools that served as controls. The results indicate that, after one year, making eyeglasses available increased average test scores by 0.11 to 0.15 standard deviations (of the distribution of the test scores). For those students who accepted the glasses, average test scores increased by 0.15 to 0.22 standard deviations.

Elizabeth Lyons

Cited by*: 0 Downloads*: 42

Remote and short-term work arrangements are increasingly common despite the limited incentives they provide for acquiring firm-specific knowledge. This paper examines the importance and cost-effectiveness of firm-specific training for remote contract workers using evidence from a field experiment conducted in an East African insurance firm that offers two-month employment contracts for its salespeople. Findings show that firm-specific training significantly increases firm revenue, but that this effect is concentrated among higher ability workers. Training has no impact on worker retention, and offering workers financial or competitive input-based incentives has no impact on these findings, or on observed worker investment in firm-specific training. These results demonstrate that high ability temporary workers may be willing to invest in firm-specific human capital without additional incentives, and that firm performance is significantly improved as a result. Implications for temporary work contracts are discussed.

Rachel Croson, Jen Shang

Cited by*: 11 Downloads*: 67

This paper examines the impact of social comparisons on fundraising and charitable contributions. We present results from a field experiment involving contribution to a public radio station. Some callers are told of the contributions decisions of others, and other callers are given no such information. We find that providing ambitions (high) social comparison information can significantly increase contributions.

Stefano DellaVigna, John A List, Ulrike Malmendier, Gautam Rao

Cited by*: 19 Downloads*: 71

Do men and women have different social preferences? Previous findings are contradictory. We provide a potential explanation using evidence from a field experiment. In a door-to-door solicitation, men and women are equally generous, but women become less generous when it becomes easy to avoid the solicitor. Our structural estimates of the social preference parameters suggest an explanation: women are more likely to be on the margin of giving, partly because of a less dispersed distribution of altruism. We find similar results for the willingness to complete an unpaid survey: women are more likely to be on the margin of participation.

Craig Gallet, John A List

Cited by*: 12 Downloads*: 4

Recent research has posited that, in advanced economies, there is a positive correlation between income inequality and development. Using a new unbalanced panel dataset for 71 countries from 1961 to 1992, we present evidence that supports this conjecture. Although many factors may be contributing to this renewed positive relationship between growth and inequality, one plausible explanation rests on the shift away from a manufacturing base towards a service base in most advanced economies.

Michael Hallsworth, John A List, Robert D Metcalfe, Ivo Vlaev

Cited by*: 1 Downloads*: 82

Framing remains one of the pillars of behavioral economics. While framing effects have been found to be quite important in the lab, what is less clear is how well evidence drawn from naturally-occurring settings conforms to received laboratory insights. We use debt obligation to the UK government as a case study to explore the 'omission bias' present in decision making with large stakes. Using a natural field experiment that generates nearly 40,000 observations, we find that repayment rates are roughly doubled when the act is reframed as one of commission rather than omission. We estimate that this reframing of the perceived nature of the action generated over $1.3 million of new yield. We find evidence that this behavior may result from a deliberate 'omission strategy', rather than a behavioral bias, as is often assumed in the literature. Our natural field experiment highlights that behavioral economics is much more than a series of empirical exercises to quench the intellectual curiosity of academics.

John A List

Cited by*: 33 Downloads*: 10

Through good and bad economic times, charitable gifts have continued to roll in largely unabated over the past half century. In a typical year, total charitable gifts of money now exceed 2 percent of gross domestic product. Moreover, charitable giving has nearly doubled in real terms since 1990, and the number of nonprofit organizations registered with the IRS grew by nearly 60 percent from 1995 to 2005. This study provides a perspective on the economic interplay of three types of actors: donors, charitable organizations, and government. How much is given annually? Who gives? Who are the recipients of these gifts? Would changes in the tax treatment of charitable contributions lead to more or less giving? How can charitable institutions design mechanisms to generate the greatest level of gifts? What about the effectiveness of seed money and matching grants?

Devah Pager

Cited by*: 98 Downloads*: 62

Over the past three decades, the number of prison inmates has increased by more than 500 percent, leaving the United States the country with the highest incarceration rate in the world. With over two million individuals currently incarcerated, and over half a million prisoners released each year, the large and growing numbers of men being processed through the criminal justice system raises important questions about the consequences of this massive institutional intervention. This paper focuses on the consequences of incarceration for the employment outcomes of black and white job seekers. The manuscript is comprised of two studies: the first, a large-scale experimental audit of employers in Milwaukee, used matched pairs of young men to apply for real entry-level jobs to measure the extent to which employers use information about criminal histories and race to screen out otherwise qualified applicants. Indeed, the results of the audit study provide clear evidence for the dramatic impact of both a criminal record and race on employment opportunities: Ex-offenders are one-half to one-third as likely to receive initial consideration from employers relative to equivalent applicants without criminal records. Perhaps most striking, the results show that even blacks without a criminal record fare no better-and perhaps worse-than do whites with criminal records.The second study, a telephone survey of these same employers, gathered self-reported information about the considerations and concerns of employers in hiring entry-level workers, with a specific focus on employers' reactions to applicants with criminal backgrounds. By linking results from the audit study to those of the employer survey, I find that employers' self-reports vastly understate the barriers faced by both blacks and ex-offenders seeking entry-level employment. Though employer surveys can tell us a great deal of useful information about the relative preferences of employers, extreme caution should be used in generalizing these results to estimates of actual behavior. The findings of this project reveal an important, and much under-recognized, mechanism of stratification. A criminal record presents a major barrier to employment, with important implications for racial disparities.

Richard Damania, Per Fredriksson , John A List

Cited by*: 0 Downloads*: 5

This study uses a three-stage common agency model to explore the linkages between trade policy, corruption and environmental policy in an imperfect market setting. We show that the effect of trade liberalization on the stringency of environmental policy depends critically on the level of corruption-in relatively corrupt countries, trade openness leads to more stringent environmental policy. In such countries, this interaction, therefore, lends trade liberalization a type of "multiplier effect," raising both economic growth and environmental policy stringency.

John A List

Cited by*: 120 Downloads*: 86

Empirical studies have provided evidence that discrimination exists in various markets, but they rarely allow the analyst to draw conclusions concerning the nature of discrimination. By combining data from bilateral negotiations in the sportscard market with complementary field experiments, this study provides a framework that amends this shortcoming. The experimental design, which includes data gathered from more than 1100 market participants, provides sharp findings: (i) there is a strong tendency for minorities to receive initial and final offers that are inferior to those received by majorities, and (ii) overall, the data indicate that the observed discrimination is not due to animus, but represents statistical discrimination.

Ufuk Akcigit, Fernando Alvarez, Stephane Bonhomme, George M Constantinides, Douglas W Diamond, Eugene F Fama, David W Galenson, Michael Greenstone, Lars Peter Hansen, Uhlig Harald, James J Heckman, Ali Hortacsu, Emir Kamenica, Greg Kaplan, Anil K Kashyap, Steven D Levitt, John A List, Robert E Lucas Jr., Magne Mogstad, Roger Myerson, Derek Neal, Canice Prendergast, Raghuram G Rajan, Philip J Reny, Azeem M Shaikh, Robert Shimer, Hugo F Sonnenschein, Nancy L Stokey, Richard H Thaler, Robert H Topel, Robert Vishny, Luigi Zingales

Cited by*: 0 Downloads*: 207

No abstract available

Michal Krawczyk, Joanna Rachubik

Cited by*: None Downloads*: None

The representativeness heuristic (RH) has been proposed to be at the root of several types of biases in judgment. In this project, we ask whether the RH is relevant in two kinds of choices in the context of gambling. Specifically, in a field experiment with naturalistic stimuli and a potentially extremely high monetary pay-out, we give each of our subjects a choice between a lottery ticket with a random-looking number sequence and a ticket with a patterned sequence; we subsequently offer them a small cash bonus if they switch to the other ticket. In the second task, we investigate the gambler's fallacy, asking subjects what they believe the outcome of a fourth coin toss after a sequence of three identical outcomes will be. We find that most subjects prefer "random" sequences, and that approximately half believe in dependence between subsequent coin tosses. There is no correlation, though, between the initial choice of the lottery ticket and the prediction of the coin toss. Nonetheless, subjects who have a strong preference for certain number combinations (i.e., subjects who are willing to forgo the cash bonus and remain with their initial choice) also tend to predict a specific outcome (in particular a reversal, corresponding to the gambler's fallacy) in the coin task.