@naval
Variolation:
There's 120m Americans under 30.
Test on healthy folks <20, pay each $30k. Find best method.
Next, offer $5k to everyone under 30 to voluntarily do this
If half accept, about 20% of the herd gets immunity for just $300b.
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This point doesn't seem contentious to medical experts. It's the same reason they seem to think a vaccine is a good solution. There's some risk, though.
Def looks like you're immune and you're not infectious but we are not totally certain of that.