This is seemingly a very complex question, with many factors in play.
We could address the cost of seed, planting, fertilizing the crop, watering, weeding, tending, hoeing, raking, harvesting the crop. All of which incur costs and labor.
In short, it really is this simple.
You HAVE to eat. YOU are relying on others to supply you with food.
Either you grow your own, or you pay those who grow, harvest, wash,package and transport. Then you pay those who order, house, refrigerate, and shelve.
Far too many, rely on others to supply their needs. It really is this simple. Do it yourself, and cut costs.
If I can produce for myself, water, electicity, heat, cooling, medicine, fuel, food, clothing, shelter..........I can eliminate the costs of so many others who charge me for the service.
What else are we doing with our time? Working to pay the provider?
Not knowing what country you are in, I can not speak with authority, but in my homeland, the USofA...
supply is NOT the question, there is MUCH food,
transportation and distribution are the problems, and the services that we pay for.