Would the world be a better place with half as many people or twice as many?

Let’s pretend that there’s a world referendum.

You get to vote for what the eventual population of the world will be.

If the decision is to halve the population, no one will be killed to achieve it, but governments will adopt policies that discourage having children; if the vote is for increasing population, governments will adopt policies that encourage people to have children.

When the desired level is reached, governments will fix the policies to achieve zero growth.

So, do you vote for twice the current population or half of it?