Overpopulation: You get to cast the deciding vote.

[robvalue]

This is difficult. Obviously it's a very extreme and specific scenario, which makes a lot of assumptions about there being no other workable solution, which seems extremely unlikely. That's fine with me, just making a note of that. I personally wouldn't like the government to force anything on anyone that isn't completely necessary. But needs must as the devil drives (!?). The government already forces a fair amount of stuff on us in the interests of society.

In this unthinkable state of affairs, I do think the analogy with vaccinations is somewhat valid. It would seem an obscene comparison in today's world, but the world in question is not today's world. Priorities can and must change. Refusing to accept the urgent need for action in the hypothetical is somewhat akin to theists refusing to answer questions about "what if God told you to kill". So in that spirit, I'll say the question is "as silly" as that perhaps, but I'll address it anyway.

If this was to be done, sterilisation as part of the birthing process would make the most sense, but it's not that straightforward because you have the males to consider. (See below.)

So I'm not sure yet, I'll give it more thought.

There is a bit of a problem though. When we say "people" are limited in how many children they can have, how is this counted? Most of you know by now... wait... Young children stop reading! You need a man and a woman in general to make a new human, but the woman parent gives birth to it (in the majority of cases, I'll ignore surrogates for the moment). Does this count towards an individual quota for both parents, or as a couple? If it's individual, we have the problem of the couple splitting up and then getting together with others. How do we make decisions then for the new couples? And of course, there would have to be a lot of DNA testing going on to prove individual qoutas, particular for the fathers, when they deny involvement.

If it's done regarding the couple, then we have problems too because couples break up. So this would have to default to individual quotas again unless we brand the mothers only.