Among over 200 COVID-19 affected countries, some are fighting to "flatten the curve", while some others are considering reopening after lockdown.It remains unclear fresh n clean cream rinse how different reopening strategies obstruct the local virus containment and impact the economy.We develop a model with travelers across heterogeneous epicenters.A low-risk area attempts to safely reopen utilizing internal policies, such as social distancing and contact tracing, and external policies, including capacity quota, quarantine, and tests.Simulations based on the COVID-19 scenario show that external policies differ in efficacy.
They can substitute each other and complement internal policies.Simultaneous relaxation of both channels may lead to a new wave of COVID-19 and large economic costs.This work highlights the importance mac miller kids poster of quantitative assessment prior to implementing reopening strategies.