The Effects of Exposure to Information about Animal Welfare Reforms on Animal Farming Opposition: A Randomized Experiment

There is limited research on the effects of animal welfare reforms, such as transitions from caged to cage-free eggs, on attitudes toward animal farming. This preregistered, randomized experiment (N = 1520) found that participants provided with information about current animal farming practices had somewhat higher animal farming opposition (AFO) than participants provided with information about an unrelated topic (d = 0.17). However, participants provided with information about animal welfare reforms did not report significantly different AFO from either the current-farming (d = -0.07) or control groups (d = 0.10). Although these latter effects on AFO were small and nonsignificant, they appeared to be mediated by changes in perceived social attitudes towards farmed animals and optimism about further reforms to factory farming. Exploratory analysis found no evidence that hierarchical meat eating justification or beliefs about how well-treated farmed animals currently are mediated the effect. Further research is needed to better understand why providing information about animal welfare reforms did not substantially increase AFO overall, whereas providing information about current practice did somewhat increase AFO.

Value of statistical life year in extreme poverty: a randomized experiment of measurement methods in rural Burkina Faso

Background Value of a Statistical Life Year (VSLY) provides an important economic measure of an individual’s trade-off between health risks and other consumption, and is a widely used policy parameter. Measuring VSLY is complex though, especially in low-income and low-literacy communities. Methods Using a large randomized experiment (N = 3027), we study methodological aspects of stated-preference elicitation with payment cards (price lists) in an extreme poverty context. In a 2 × 2 design, we systematically vary whether buying or selling prices are measured, crossed with the range of the payment card. Results We find substantial effects of both the pricing method and the list range on elicited VSLY. Estimates of the gross domestic product per capita multiplier for VSLY range from 3.5 to 33.5 depending on the study design. Importantly, all estimates are economically and statistically significantly larger than the current World Health Organization threshold of 3.0 for cost-effectiveness analyses. Conclusions Our results inform design choice in VSLY measurements, and provide insight into the potential variability of these measurements and possibly robustness checks.

Effects of political versus expert messaging on vaccination intentions of Trump voters

To increase COVID-19 vaccine uptake in resistant populations, such as Republicans, focus groups suggest that it is best to de-politicize the issue by sharing five facts from a public health expert. Yet polls suggest that Trump voters trust former President Donald Trump for medical advice more than they trust experts. We conducted an online, randomized, national experiment among 387 non-vaccinated Trump voters, using two brief audiovisual artifacts from Spring 2021, either facts delivered by an expert versus political claims delivered by President Trump. Relative to the control group, Trump voters who viewed the video of Trump endorsing the vaccine were 85% more likely to answer “yes” as opposed to “no” in their intention to get fully vaccinated (RRR = 1.85, 95% CI 1.01 to 3.40; P = .048). There were no significant differences between those hearing the public health expert excerpt and the control group (for “yes” relative to “no” RRR = 1.14, 95% CI 0.61 to 2.12; P = .68). These findings suggest that a political speaker’s endorsement of the COVID-19 vaccine may increase uptake among those who identify with that speaker. Contrary to highly-publicized focus group findings, our randomized experiment found that an expert’s factually accurate message may not be effectual to increase vaccination intentions.

Public Service Announcements and Promoting Face Masks During the COVID-19 Pandemic

ABSTRACT Wearing face masks to combat the spread of COVID-19 became a politicized and contested practice in the United States, largely due to misinformation and partisan cues from masking opponents. This article examines whether Public Service Announcements (PSAs) can encourage the use of face masks. We designed two PSAs: one describes the benefits of using face masks; the other uses a novel messenger (i.e., a retired US general) to advocate for them. We conducted two studies. First, we aired our PSAs on television and surveyed residents of the media market to determine if they saw the PSA and how they felt about wearing face masks. Second, we conducted a randomized experiment on a diverse national sample. Both studies suggest that exposure to our PSAs increased support for face masks and induced greater compliance with public health advice. These findings have implications for how governments might fight pandemics.