Recently I wrote about how just because people say they are willing to pay for something (stated preference) doesn’t mean they actually would (revealed preference). Today in the New York Times comes a perfect real world example:

Sales of Green Works have fallen to about $60 million a year, and those of other similar products from major brands like Arm & Hammer, Windex, Palmolive, Hefty and Scrubbing Bubbles are sputtering. “Every consumer says, ‘I want to help the environment, I’m looking for eco-friendly products,’ ” said David Donnan, a partner in the consumer products practice at the consulting firm A. T. Kearney. “But if it’s one or two pennies higher in price, they’re not going to buy it. There is a discrepancy between what people say and what they do.”

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