[jyl]

Suppose you developed a vaccine for AIDS, and sold 600MM doses for $50 (in the OECD countries) and another 500MM doses for $10 (for those in the developing world who could afford $10).

Bummer for the other 5BN people in the world, but anyway you don't want to totally eradicate AIDS. You want a reason to continue selling vaccinations.

That is $35BN in revenue. Sounds pretty lucrative to me.

I guess an even better, alternative vaccine would be one that doesn't completely prevent people from getting AIDS, but mitigates the disease so that it is fully curable - with an expensive regimen of the other drugs that you sell. Now that would be a nice outcome, cackle cackle.