Half of the world infected with Coronavirus.
Bad things. If we assume that 1% of the infected died, and 25% of the infected were effected significantly, we'd be looking at around an 8th of the pop.
Historically, civilizations enter a state of near collapse at around 15% casualties, but these were peasant economies with a large number of essentially interchangeable parts.
In a modern society with specialized workers, we'd realistically see a state of near collapse at about 5% of the population.
Near collapse is very different from collapsed. As an example, the Roman Empire was in a state of near collapse for about a thousand years before it fell completely.
Post-Czar Russian was in a state of collapse for about 40 years before it recovered, and then later dipped back into near collapse.
So it'd be bad.
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