Mass testing is needed to open the economy.
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Why? To what purpose?
You test negative, it means you have not been exposed.
You test positive it means you have been exposed and are either:
A. Newly exposed
B. You were exposed long ago and were asymptomatic.
You plan on not “mixing” exposed and non-exposed? Are non-exposed supposed to wait for a vaccine that may never be available? (Covid-19 is a corona virus meaning it is related to common cold viruses. See any vaccines for common colds?)
Why? To what purpose?”
To keep the economy open, the way Taiwan has done it, by testing people and letting those who test negative keep working.