Labour Market Shocks and Parental Investments during the Covid-19 Pandemic.

This paper studies spill-over effects of parental labour market shocks at two time points in the Covid-19 crisis: right after its onset in April 2020, and in January 2021. We use rich data from the UK to look at the consequences of immediate and persistent shocks that hit parents' economic livelihoods. These negative labour market shocks have substantially larger impacts when suffered by fathers than by mothers. Children of fathers that suffered the most severe shocks - earnings dropping to zero - are the ones that are consistently impacted. In April 2020, they were 10 percentage points less likely to have received additional paid learning resources, but their fathers were spending about 30 more minutes per day helping them with school work. However, by January 2021, this latter association switches sign, as the negative spill-over onto children's education occurred for those fathers facing more persistent, negative labour market shocks as the crisis progressed. The paper discusses potential mechanisms driving these results, finding a sustained deterioration of household finances and a worsening of father's mental health to be factors at play.

Schools under mandatory testing can mitigate the spread of SARS-CoV-2.

We use event study models based on staggered summer vacations in Germany to estimate the effect of school reopenings after the summer of 2021 on the spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Estimations are based on daily counts of confirmed coronavirus infections across all 401 German counties. A central antipandemic measure in German schools included mandatory rapid testing multiple times per week. Our results are consistent with mandatory testing contributing to the containment of the viral spread. We find a short-term increase in infection rates right after summer breaks, indicating the uncovering of otherwise undetected (asymptomatic) cases through the testing. After a period of about 2 wk after school reopenings, the growth of case numbers is smaller in states that reopened schools compared with the control group of states still in summer break. The results show a similar pattern for older age groups as well, arguably as a result of detected clusters through the school testing. This means that under certain conditions, open schools can play a role in containing the spread of the virus. Our results suggest that closing schools as a means to reduce infections may have unintended consequences by giving up surveillance and should be considered only as a last resort.

Does re-opening schools contribute to the spread of SARS-CoV-2? Evidence from staggered summer breaks in Germany

This paper studies the effect of the end of school summer breaks on SARS-CoV-2 cases in Germany. The staggered timing of summer breaks across federal states allows us to implement an event study design. We base our analysis on official daily counts of confirmed coronavirus infections by age groups across all 401 German counties. We consider an event window of two weeks before and four weeks after the end of summer breaks. We do not find evidence of a positive effect of school re-openings on case numbers. For individuals aged between 5 and 59 years, comprising school-aged children and their parents, our preferred specification indicates that the end of summer breaks had a negative but insignificant effect on the number of new confirmed cases. Our results are not explained by changes in mobility patterns around school re-openings arising from travel returnees. Analyses of Google Trends data suggest that behavioral changes of parents may have contributed to contain larger outbreaks after school re-openings. We conclude that school re-openings in Germany under strict hygiene measures combined with quarantine and containment measures have not increased the number of newly confirmed SARS-CoV-2 infections.

Pandemic meets pollution: Poor air quality increases deaths by COVID-19.

We study the impact of short-term exposure to ambient air pollution on the spread and severity of COVID-19 in Germany. We combine data at the county-by-day level on confirmed cases and deaths with information on local air quality and weather conditions. Following Deryugina et al. (2019), we instrument short-term variation in local concentrations of particulate matter (PM10) by region-specific daily variation in wind directions. We find significant positive effects of PM10 concentration on death numbers from four days before to ten days after the onset of symptoms. Specifically, for elderly patients (80+ years) an increase in ambient PM10 concentration by one standard deviation between two and four days after developing symptoms increases the number of deaths by 19 percent of a standard deviation. In addition, higher levels air pollution raise the number of confirmed cases of COVID-19 for all age groups. The timing of effects surrounding the onset of illness suggests that air pollution affects the severity of already-realized infections. We discuss the implications of our results for immediate policy levers to reduce the exposure and level of ambient air pollution, as well as for cost-benefit considerations of policies aiming at sustainable longer-term reductions of pollution levels.