Inferior Goods

A reader alerts me to a story about income elasticities:

The economy is in tatters and, for millions of people, the future is uncertain. But for some employees at the Hormel Foods Corporation plant here, times have never been better. They are working at a furious pace and piling up all the overtime they want.

The workers make Spam, perhaps the emblematic hard-times food in the American pantry....

Even as consumers are cutting back on all sorts of goods, Spam is among a select group of thrifty grocery items that are selling steadily.

Pancake mixes and instant potatoes are booming. So are vitamins, fruit and vegetable preservatives and beer, according to data from October compiled by Information Resources, a market research firm.

“We’ve seen a double-digit increase in the sale of rice and beans,” said Teena Massingill, spokeswoman for the Safeway grocery chain, in an e-mail message. “They’re real belly fillers.”

Economics students will recognize these as inferior goods: Goods for which demand rises when income falls.

Note: "Inferior" is not a pejorative, just a description of the sign of the income elasticity.