Final answer:
Joel's purchases fall under the category of various product departments at the supermarket, which is of interest to the field of Business.
Step-by-step explanation:
In this case, the subject of the question is Business.
When Joel buys laundry detergent, toilet paper, and a bag of chips at his local supermarket, these purchases can be categorized as different product departments within the store. Major grocery stores typically organize their products into departments such as dairy, meats, produce, bread, cereals, and so forth. Each aisle contains hundreds, if not thousands, of different products for customers to buy and consume.
So, Joel's purchases fall under the category of various product departments at the supermarket, which is of interest to the field of Business.