[barelyauser]

Pretty much this. It was a huge disappointment for me to understand that even if I made a revolutionary discovery and doubled the yield of food crops, people would reproduce and the prices (and availability) of food would not change.

[fellowniusmonk]

I don't think food scarcity/availability/price plays any appreciable role in developed nations birth rates but I'd be willing to consider evidence that it does.

[al_borland]

I think price is a factor. It isn’t uncommon for someone to say, “another mouth to feed.”

When adding people to a family, food is probably the biggest non-negotiable cost going up.

I’d also expect to see a strong correlation between family size and the percent of meals eaten at home. Going out to eat quickly becomes unaffordable as family size grows.

[getwiththeprog]

Yes, but if you invented a system of crop rotation that you could play Doom on, now that would get some traction :)

[Animats]

Population is no longer food limited. Obesity, though...