Answer:
because this organic process need more time to produce food.
Explanation:
since in the organic farming or agriculture, there is not use of hormones or pesticides, the plants and animals grow slowly, if they have more nutrients than the normal food, they spend more time, that is the reason why they are expensive, not just because the hour-human - work is bigger, also because the time to return the incomes are longer.
Hope this info is useful.