disease and the availability of tests to detect asymptomatic spreaders is limited. Contact tracing is a testing strategy that … lockdown corrects this externality, allowing policymakers to buy time to expand the testing scale so as to preserve the testing … system. If the testing capacity is sufficiently large, contact tracing alone can halt the spread of the virus because it …

This paper investigates the role of testing and age-composition in the Covid-19 epidemic. We augment a standard SIR … cold. Testing reduces the time of uncertainty. Individuals are heterogeneous with respect to age. Younger people are less … policy responses in terms of testing, confinements, and selective mixing by age group. …