If the price of corn increases, it is true that farmers will always decrease their corn production to grow more soybeans, regardless of the market demand for soybeans.

The statement that farmers will always decrease corn production to grow more soybeans when corn prices increase is not necessarily true. Farmers make decisions based on several factors, including market demand and potential profits. If the price of corn rises, it might encourage farmers to grow more corn instead, especially if there is still strong demand for it. For example, if corn prices rise due to high demand for ethanol, farmers may choose to grow more corn rather than switch to soybeans, which might not be as profitable at that time. Therefore, while price changes can influence what farmers decide to grow, they do not always lead to a decrease in corn production.