How to hire helpers? Evidence from a field experiment

How to hire voluntary helpers? We shed new light on this question by reporting a field experiment in which we invited 2859 students to help at the ‘ESA Europe 2012’ conference. Invitation emails varied non-monetary and monetary incentives to convince subjects to offer help. Students could apply to help at the conference and, if so, also specify the working time they wanted to provide. Just asking subjects to volunteer or offering them a certificate turned out to be significantly more motivating than mentioning that the regular conference fee would be waived for helpers. By means of an online-survey experiment, we find that intrinsic motivation to help is likely to have been crowded out by mentioning the waived fee. Increasing monetary incentives by varying hourly wages of 1, 5, and 10 Euros shows positive effects on the number of applications and on the working time offered. However, when comparing these results with treatments without any monetary compensation, the number of applications could not be increased by offering money and may even be reduced.     

Do watching eyes affect charitable giving? Evidence from a field experiment

The presence of implicit observation cues, such as picture of eyes, has been shown to increase generosity in dictator games, and cooperative behavior in field settings. I combine these approaches, by testing if a picture of watching eyes affects unconditional giving in a natural environment, where the recipient is a charity organization. Taken together, this study reduces the influence of three potential confounding factors in previous experiments: (i) experimenter demand effects, (ii) that the facial cue reminds subjects of a human counterpart, and (iii) a social multiplier effect. Specifically, the paper reports results from an experiment, conducted in a Swedish supermarket chain, where customers face a naturally occurring decision problem. People who recycle cans and bottles have to choose whether to keep the recycled amount or donate it to a charity organization. By posting a picture of human eyes on recycling machines, I am able to test whether this causes an increase in donations to the charity. Based on a sample covering a 12-day period, 38 stores and 16775 individual choices, I find no general effect. However, when controlling for store and day fixed effects, and using a proxy for store attendance, the picture of eyes increased donated amount by 30 percent during days when relatively few other people visited the store. This result gives further support to the conclusion that subtle social cues can invoke reputation concerns in humans, although the relatively small effect suggests that previous estimates could be biased upward, or at least that the influence of observational cues is context dependent.     

Gender differences in occupational mobility – evidence from Portugal

In this paper we evaluate if gender influences the pattern of upward and downward occupational mobility. With data for Portugal in the period 1998–2009, we find that women have a lower probability of upward mobility and a higher probability of downward mobility. The results also reveal the importance of some other determinant factors, especially education and initial occupation. Additionally, considering an analysis in which we group occupations into four ranked categories (low, medium-low, medium-high, and high level occupations), we confirm that the determinants of occupational mobility depend on the ranking of the initial occupation. This analysis allows us to conclude that the unfavorable pattern of occupational mobility in the case of women is due, essentially, to the disadvantage they have at the bottom of the distribution. On the contrary, in the top occupations, the results suggest the existence of equality between genders.     

Θ The cultural transmission of trust norms: Evidence from a lab in the field on a natural experiment

We conduct trust games in three villages in a northeastern Romanian commune. From 1775–1919, these villages were arbitrarily assigned to opposite sides of the Austrian and Ottoman/Russian border despite being located seven kilometers apart. This plausibly exogenous border assignment affected local institutions and late-18th century migration in a manner that likely also affected trust. Conditional on trust norms being affected by these centuries-old historical circumstances, our experimental design tests the degree to which such norms are transmitted intergenerationally. Consistent with theoretical predictions, we find that participants on the Austrian side that also have family roots in the village are indeed more likely to trust outsiders.     

Reserve requirements as a macroprudential instrument – Empirical evidence from Brazil

Emerging market central banks are often reluctant to raise interest rates when facing credit booms driven by capital inflows, and they instead use reserve requirements as an additional instrument. We compare the macroeconomic effects of interest rate and reserve requirement shocks by estimating a structural vector autoregressive model for Brazil. For both instruments, discretionary tightening results in a credit decline. Contrary to an interest rate shock, however, a positive reserve requirement shock leads to an exchange rate depreciation, a current account improvement, and an increase in prices. The different effects highlight the role of reserve requirement policy as a complement to rather than a substitute for interest rate policy. The results support the bank lending channel as the main transmission mechanism for reserve requirement policy.     

Contestability in bus markets – evidence from the British de-regulated market

Following the 1985 Transport Act in Great Britain, reforms in the provision of bus services continue across Europe and other parts of the world to this day. The British experience, however, remains a key point of study in informing these continuing developments. This article looks at the issue of contestability in bus markets, and tests for the existence of the contestable market in Britain through an examination of fare levels, profit margins and technical efficiencies in 90 identifiable bus markets. The main conclusion is that there is evidence of the contestable market in Britain, however it can hardly be described as widespread, only found to be present in 15 of the 90 markets identified in the sample. The real issue however, particularly with regard to continuing reforms elsewhere in Europe, is the ability of regulatory authorities to maintain competitive and contestable (free) markets and the research suggests that in the face of market forces this is simply not possible. The only conclusion therefore is that contestability in the free market is not sustainable, and thus can only be introduced directly through franchising.     

Social heterogeneity and local bias in peer-to-peer lending – evidence from China

This paper investigates the presence of local bias in the peer-to-peer (P2P) lending market and explores the social heterogeneous factors that may affect the formulation of the investor's local bias. We find that local biases are commonly present among investors. Investors have a 9.3% higher probability and put 105% more money in lending to local borrowers. We also find that overinvesting in local loans is correlated with higher default risk, lower recovery rate, and lower realized return, suggesting the underperformance of these locally biased investors. By taking advantage of the diverse local culture and institutional features in China, we further show that social heterogeneity, including geography, language, and social trust, affects the degree of local biases in the P2P lending market. We propose two debiasing techniques from the P2P platforms’ perspective.     

Does oil corrupt? Evidence from a natural experiment in West Africa

This paper explores the oil discovery announcements in Sao Tome and Principe (1997-1999) to assess the role of natural resources in determining corruption. For this purpose, we use a natural experiment framework which contrasts Sao Tome and Principe to Cape Verde, a control West African country sharing the same colonial past and important recent economic and political shocks. Our measurement is based on tailored household surveys we conducted in both island countries. The unique survey instrument was retrospective and used personal histories to elicit memories from the respondents. We analyze changes in perceived corruption across a wide range of public services and allocations. We find clearest increases on vote buying, education (namely in the allocation of scholarships) and customs, ranging from 31 to 40% of the subjective scale. We interpret these findings as symptoms of increased competition for core state resources.     

Do we lie in groups? An experimental evidence

We study whether there is a difference between individual and group unethical behaviour in an experimental study among adolescents. We find that on average, groups cheat more than individuals, but there are important differences across age. Younger groups cheat more than younger individuals but there is no difference between older individuals and groups. The way in which groups are formed and friendship ties among group members do not seem to matter.     

Exposure to female colleagues breaks the glass ceiling—Evidence from a combined vignette and field experiment

We study discrimination among recruits in the Norwegian Armed Forces during boot camp. In a vignette experiment female candidates are perceived as less suited to be squad leaders than their identical male counterparts. Adding positive information leads to higher evaluations of the candidates, but does not reduce the amount of discrimination. However, randomized intense collaborative exposure to female colleagues reduces discriminatory attitudes: Male soldiers who were randomly assigned to share room and work in a squad with female soldiers during the recruit period do not discriminate in the vignette experiment.     

Does preschool education attendance matter? Evidence from a natural experiment in Spain

The non-compulsory and non-free of charge character of preschool education level before 3 years old in Spain raises some doubts about the exogenous nature of this variable. This article provides new evidence about the impact of preschool years on educational outcomes by exploiting a peculiar Spanish database that supplies information on two classrooms at fourth grade in primary schools where students were randomly allocated into each group. Using an identification strategy that reproduces a natural experiment, we find that belonging to the group with more average years of preschool education significantly and positively impacts on fourth-grade students’ average outcomes. Particularly, an increase of one standard deviation in the difference in years of preschool attendance results in an increase of 0.16 (0.13) standard deviations in the group achievement for mathematics (reading). In view of the importance of preschool education and considering that preschool attendance before 3 years old is related with socio-economic variables, we conclude that extending free preschool education to the 2-year-old age group in Spain should be considered especially for students in families with less favourable backgrounds.     

Is high-speed rail heading towards a low-carbon industry? Evidence from a quasi-natural experiment in China

Existing studies have investigated the environmental dividends of substituting high-speed rail (HSR) for other energy-intensive vehicles from an engineering standpoint, but they have yet to explore the economic effects of HSR and the associated carbon emissions reduction benefits. To fill the research gap, we use panel data from 285 Chinese cities between 2004 and 2014, and employ a spatial difference-in-differences model to empirically examine the impact of HSR opening on industrial CO₂ emissions. After controlling for spillover effects from neighboring HSR cities, our results show that cities offering HSR services significantly reduce their own industrial CO₂ emissions. This finding is robust and is unaffected by outliers, control group selection, time trends, geography and expectation factors, or endogeneity. The mechanism test reveals that the structural transformation effect, technological innovation effect, and investment attractiveness effect are three intermediate influence channels. Further research finds that the emissions reduction benefit increases as the spatial and temporal intensities of HSR openings ascend the ladder, and HSR services have a spillover effect within a 300-kilometer radius. Moreover, the carbon benefit of China’s HSR far surpasses its carbon footprint, indicating that China’s HSR is green after accounting for economic emissions reductions that were often neglected in prior research. Based on these findings, we recommend that China accelerate HSR expansion in order to reduce carbon emissions in a scientific and responsible manner.     

Do household definitions matter in survey design? Results from a randomized survey experiment in Mali

Household definitions used in multi-topic household surveys vary between surveys but have potentially significant implications for household composition, production, and poverty statistics. Standard definitions of the household usually include some intersection of keywords relating to residency requirements, common food consumption, and intermingling of income or production decisions. Despite best practices intending to standardize the definition of the household, it is unclear which types of definitions or which intersections of keywords in a definition result in different household compositions. This paper conducts a randomized survey experiment of four different household definitions in Mali to examine the implications for household-level statistics. This approach permits analysis of the trade-offs between alternative definition types. We find that additional keywords in definitions increase rather than decrease household size and significantly alters household composition. Definitions emphasizing common consumption or joint production increase estimates of the levels of household assets and consumption statistics, but not on per adult equivalency asset and consumption statistics, relative to open-ended definitions of the household. In contrast, definition type did not affect production statistics in levels, though we observe significant differences in per adult equivalency terms. Our findings suggest that variations in household definition have implications for measuring household welfare and production.     

Are impatient farmers more risk-averse? Evidence from a lab-in-the-field experiment in rural Uganda

Based on data from a field-experiment in rural Uganda, we show that impatient farmers are more risk-averse than patient farmers. We relied on a simplified version of the Convex Time Budget (CTB) method to elicit farmers’ time preferences and on an independent method for eliciting their risk-preferences. We report two important findings. First, we show that our simplified CTB method applied to farmers from Uganda replicates the key findings of Andreoni and Sprenger’s lab experiments that involved student subjects. Second, we establish the existence of a negative correlation between risk tolerance and impatience, based on two independent measures.     

Does context matter more for hypothetical than for actual contributions? Evidence from a natural field experiment

We investigated the importance of the social context for people’s voluntary contributions to a national park in Costa Rica, using a natural field experiment. Some subjects make actual contributions while others state their hypothetical contribution. Both the degree of anonymity and information provided about the contributions of others influence subject contributions in the hypothesized direction. We found a substantial hypothetical bias with regard to the amount contributed. However, the influence of the social contexts is about the same when the subjects make actual monetary contributions as when they state their hypothetical contributions. Our results have important implications for validity testing of stated preference methods: a comparison between hypothetical and actual behavior should be done for a given social context.      

The challenge of rural financial inclusion – evidence from microfinance

Financial inclusion is said to foster development and growth. However, progress in financial inclusion has been slow in rural areas where poverty is most pronounced. This is often attributed to higher transaction costs, higher risks and a more unfavourable contracting environment which makes it more difficult for financial institutions to achieve and maintain sustainability in rural compared to urban areas. Based on data covering 772 microfinance institutions (MFIs) over the period 2008–2013, we test whether rural financial inclusion, notably lending to rural borrowers, is hampered by stronger sustainability challenges than inclusion in urban markets. Our results suggest that a higher share of rural borrowers has no direct effect on MFI sustainability. However, we find that MFIs with a higher share of rural borrowers are less able to exploit economies of scale and productivity effects. Thus, our results provide support for the view that sustainability challenges make it more difficult to achieve progress in financial inclusion in rural than in urban areas.     

What motivates common pool resource users? Experimental evidence from the field

This paper develops and tests several models of pure Nash strategies of individuals who extract from a common pool resource when they are motivated by a combination of self-interest and preferences for altruism, reciprocity, inequity aversion, or conformity. Using data from experiments conducted in three regions of Colombia that depend critically on a local fishery, we test whether an econometric summary of the subjects’ pure Nash strategies is consistent with one or more of these models. We find that a model that balances self-interest with a strong preference for conformity best describes average strategies.     

Do environmental benefits matter? Evidence from a choice experiment among house owners in Germany

Residential buildings strongly contribute to global CO₂ emissions due to the high energy demand for electricity and heating, particularly in industrialised countries. Within the EU, decentralised heat generation is of particular relevance for future climate policy, as its emissions are not covered by the EU ETS. We conducted a choice experiment concerning energy retrofits for existing houses in Germany. In the experiment, the approximately 400 sampled house owners could either choose a modern heating system or an improved thermal insulation for their home. We used standard and mixed logit specifications to analyse the choice data. We found environmental benefits to have a significant impact on choices of heating systems. However, they played no role in terms of insulation choices. Based on the estimated mixed logit model, we further obtained willingness-to-pay (WTP) measures for CO₂ savings.     

How does anti-corruption affect firm labour inputs? Evidence from a quasi-natural experiment in China

This study investigates the impact of anti-corruption on firm labour inputs. Using the province-by-province rollout of the central inspection team campaign in China, we find that the labour intensity rises by 9% in the firms located in the provinces inspected by the central inspection teams. Moreover, firms with low corruption are more susceptible to the policy shock.     

Does non-employment based health insurance promote entrepreneurship? Evidence from a policy experiment in China

Previous researchers have shown that employment-based health insurance lowers job mobility and deters entrepreneurship. The Urban Resident Basic Medical Insurance (URBMI) program, piloted in 2007 in China and fully established in 2009, offers health insurance to about 271 million urban residents without formal employment. Before the implementation of URBMI, most urban residents obtained health insurance through their employers, and therefore a large number of unemployed and self-employed individuals were uninsured. Thus, URBMI creates a new insurance option that does not depend on formal employment and may promote entrepreneurship. We take advantage of this policy change to evaluate the effect of URBMI on self-employment. Using 2000–2011 data from the China Health and Nutrition Survey and a difference-in-differences approach with propensity score weighting, we found that URBMI increased self-employment rate by at least 8.73% for the overall population. The result was mainly driven by the URBMI’s impact on unhealthy workers, individuals with 12 years of schooling or less, and workers above 30 years old.