[user22]

because building the infrastructure takes N period of time and X cost.

possible the infrastructure won't be complete before prices go down. possible that prices will go down before you recoup the costs.

On the other hand, depending where you live and local rules, it is easy to have a few layer chickens for eggs. Having 4 or 5 chickens can mean 3 eggs a day which can keep you supplied. Costs would be a coop, food, water, and chicks. Layer feed where I live is 18 bucks for 50 lbs which can last for quite a while with that small number of chickens.