Will that price be affordable to most people? To whom will you sell your potatoes? What type of soil do potatoes prefer? If you buy a more fertile arable land, will you be able to grow more potatoes with less expenses? There are pests too, they might eat seedlings, leafs, tubers. Have you ever grown potatoes? Do you know how much money you need to invest to grow one kg of potatoes? You can make it cheaper if you don't use fertilizers, but how will that affect your crop? Will you get less potatoes? Does it pay off to buy fertilizers or not? At what cost will you sell your potatoes? Obviously, you can't sell them for the same amount of money you've invested to grow them, you need to earn something too. Even nowadays there are many examples of biology influencing economics. Back in the days of feudalism when arable land was the most valuable possession and the main source of income, knowledge about plants and how all the biotic and abiotic factors affect their growth were essential. Did you notice both economics and ecology have the same prefix, eco- ? It is derived from Greek word οἶκος (oikos) which means house or home.
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