That's true, but you need to unlock the tech for you to have enough food to feed everyone comfortably. Until it's comfy you have a fragile economy that occasion

That's true, but you need to unlock the tech for you to have enough food to feed everyone comfortably. Until it's comfy you have a fragile economy that occasionally falls into famine, so everyone would have to make plans to accommodate that, ie they can't build the pyramid too high. Your problem also isn't just inventing better methods, you also have to rearrange society to take advantage of this new possibility.