Many economic studies use shift-share instruments to estimate causal effects. Often, all shares need to fulfill an exclusion restriction, making the identifying assumption strict. This paper proposes to use methods that relax the exclusion restriction by selecting invalid shares. I apply the...

The behavior of populations is central for the containment of infectious diseases. Migrant communities from countries which have experienced a strong increase in infections may be more at risk of infection. However, they may also be more exposed to information on the severity of the disease and...