During the pandemic, news accounts have emerged of potato farmers forced to leave potato harvests to rot in fields because restaurant demand has plummeted. As you might imagine, the price of potatoes has also plummeted. This is much to the benefit of McDonald's, which is the largest purchaser of potatoes in the USA. To wit, McDonald's has a "Free Fries on Friday" promotion for mobile app users who use it to order and pay. The potatoes McDonald's purchases are considered ______ products