Answer:
Non-essential commodities
Step-by-step explanation:
When the economy is in bad shape, people will usually restrict their expenses to only the essential items they really need: food, clothes, housing, transportation. Even within those categories, they'll make more economical choices (for example ground beef instead of a t-bone steak).
When the economic situation is better, they will improve their selection and choices in the 4 categories mentioned, and will also spend on luxury and non-essential commodities, like entertainment (movies), a second car, jewels, and so on.