Addressing vaccine hesitancy: experimental evidence from nine high-income countries during the COVID-19 pandemic.

We study the impact of public health messages on intentions to vaccinate and vaccination uptakes, especially among hesitant groups. We performed an experiment comparing the effects of egoistic and altruistic messages on COVID-19 vaccine intentions and behaviour. We administered different messages at random in a survey of 6379 adults in December 2020, following up with participants in the nationally representative survey Citizens' Attitudes Under COVID-19 Project covering nine high-income countries (Australia, Austria, France, Germany, Italy, New Zealand, Sweden, the UK and the USA). Four alternative interventions were tested, based on narratives of (1) self-protection, (2) protecting others, (3) reducing health risks and (4) economic protection. We measure vaccination intentions in the December 2020 survey and elicit actual vaccination behaviour by respondents in the June/July 2021 survey. Messages conveying self-protection had no effect on vaccine intentions but altruistic messages, emphasising protecting other individuals (0.022, 95% CI -0.004 to 0.048), population health (0.030, 95% CI 0.003 to 0.056) and the economy (0.038, 95% CI 0.013 to 0.064) had substantially stronger effects. These effects were stronger in countries experiencing high COVID-19 mortality (Austria, France, Italy, Sweden, the UK and the USA), where health risks may have been more salient, but weaker and, in several cases, not significant where mortality was low (Australia, Germany and New Zealand). On follow-up at 6 months, these brief communication interventions corresponded to substantially higher vaccination uptake. Our experiments found that commonly employed narratives around self-protection had no effect. However, altruistic messages about protecting individuals, population health and the economy had substantially positive and enduring effects on increasing vaccination intentions. Our results can help structure communication campaigns during pandemics and are likely to generalise to other vaccine-preventable epidemics.

Positive Spillovers from Negative Campaigning.

Negative advertising is frequent in electoral campaigns, despite its ambiguous effectiveness: Negativity may reduce voters' evaluation of the targeted politician but may have a backlash effect for the attacker. We study the effect of negative advertising in electoral races with more than two candidates with a large-scale field experiment during an electoral campaign for mayor in Italy and a survey experiment in a fictitious mayoral campaign. In our field experiment, we find a strong, positive spillover effect on the third main candidate (neither the target nor the attacker). This effect is confirmed in our survey experiment, which creates a controlled environment with no ideological components or strategic voting. The negative ad has no impact on the targeted incumbent, has a sizable backlash effect on the attacker, and largely benefits the idle candidate. The attacker is perceived as less cooperative, less likely to lead a successful government, and more ideologically extreme.

The politics of ageing and retirement: Evidence from Swiss referenda.

Ageing threatens the financial sustainability of pay-as-you-go pension systems, since it increases the share of retirees to workers. An often-advocated policy response is to increase retirement age. Ironically, however, the political support for this policy may actually be hindered by population ageing. Using Swiss administrative voting data at municipal level from pension reform referenda (and individual survey data), we show in fact that individuals close to retirement tend to oppose policies that postpone retirement, whereas younger and older individuals are more favourable. The current process of population ageing and the associated increase in the size of the cohort of individuals close to retirement may partially explain why a pension reform that increased retirement age for women was approved in two referenda in 1995 and 1998, while a reform that proposed a similar increase in women's retirement age was defeated in a 2017 referendum.

Gender differences in COVID-19 attitudes and behavior: Panel evidence from eight countries.

The initial public health response to the breakout of COVID-19 required fundamental changes in individual behavior, such as isolation at home or wearing masks. The effectiveness of these policies hinges on generalized public obedience. Yet, people's level of compliance may depend on their beliefs regarding the pandemic. We use original data from two waves of a survey conducted in March and April 2020 in eight Organisation for Economic Co-operation and Development countries (n = 21,649) to study gender differences in COVID-19-related beliefs and behaviors. We show that women are more likely to perceive COVID-19 as a very serious health problem, to agree with restraining public policy measures, and to comply with them. Gender differences in attitudes and behavior are sizable in all countries. They are accounted for neither by sociodemographic and employment characteristics nor by psychological and behavioral factors. They are only partially mitigated for individuals who cohabit or have direct exposure to the virus. We show that our results are not due to differential social desirability bias. This evidence has important implications for public health policies and communication on COVID-19, which may need to be gender based, and it unveils a domain of gender differences: behavioral changes in response to a new risk.

Information and Women's Intentions: Experimental Evidence About Child Care.

We investigate the effect of providing information about the benefits to children of attending formal child care when women intend to use formal child care so they can work. We postulate that the reaction to the information differs across women according to their characteristics, specifically their level of education. We present a randomized experiment in which 700 Italian women of reproductive age with no children are exposed to positive information about formal child care through a text message or a video, while others are not. We find a positive effect on the intention to use formal child care and a negative effect on the intention to work. This average result hides important heterogeneities: the positive effect on formal child care use is driven by high-educated women, while the negative effect on work intention is found only among less-educated women. These findings may be explained by women's education reflecting their work-family orientation, and their ability to afford formal child care.