The UK is considering imposing a 14-day quarantine on people who enter
the country.
Businesses object.
Is such a quarantine useful?
Imposing quarantine on people entering your country makes
rational sense for reducing the spread of Covid-19 in two situations,
as far as I can see.
-
They are coming from countries where coronavirus is more prevalent
than it is in your country. In that case, they might transmit the
virus more than the people who were already in your country.
-
Your country has an effective system of tracing contacts and
quarantining people who get exposed. Since you can't track the
previous contacts of people who enter, you need to consider they may
have been exposed before they came.
Outside of these two situations, quarantining people for entering the
country is a pointless nuisance that serves only to help politicians
scapegoat foreigners. Maybe that is why Bogus Johnson wants to do it.