
It's a trend explained by the concept of "inferior goods," an economics term that less describes the makeup of a product than its place in consumer-demand theory. They're basically goods or services for which demand increases as income decreases and vice versa. They're staples that are somewhat dispensable in good times but more desirable in bad ones. Commonly cited examples include ramen noodles, bus transit, lipstick (as the New York Times recently postulated) and, often, Spam.
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