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Why do the keypads on drive-up cash machines have Braille dots? Why are round-trip fares from Orlando to Kansas City higher than those from Kansas City to Orlando?
For decades, Robert Frank has been asking his economics students to pose and answer questions like these as a way of learning how economic principles operate in the real world--which they do everywhere, all the time.
Once you learn to think like an economist, all kinds of puzzling observations start to make sense. Drive-up ATM keypads have Braille dots because it's cheaper to make the same machine for both drive-up and walk-up locations. Travelers from Kansas City to Orlando pay less because they are usually price-sensitive tourists with many choices of destination, whereas travelers originating from Orlando typically choose Kansas City for specific family or business reasons.
The Economic Naturalist employs basic economic principles to answer scores of intriguing questions from everyday life, and, along the way, introduces key ideas such as the cost benefit principle, the "no cash left on the table" principle, and the law of one price. There is no more delightful and painless way of learning these fundamental principles.
"Smart, snappy and delightful. Bob Frank is one of America's best writers on economics." -- Tyler Cowen, George Mason University, and author of In Praise of Commercial Culture and What Price Fame?
"Fascinating, mind-expanding, and lots of fun." -- Steven Pinker, Harvard University, and author of The Blank Slate, How the Mind Works, and The Stuff of Thought
240 pages, Paperback
First published January 1, 2006
I tell my students that their answers to the questions should be viewed as intelligent hypotheses suitable for further refinement and testing. They are not meant to be the final word. When Ben Bernanke and I described Bill Tjoa's example about drive-up ATM keypads with Braille dots in our introductory economics textbook, somebody sent me an angry email saying that the real reason for the dots is that the American with Disabilities Act requires them. He sent me a link to a web page documenting his claim. Sure enough, there is a requirement that all ATM keypads have Braille dots, even at drive-up locations. Having Braille dots on drive-up machines might even be useful on rare occasions, as when a blind person visits a drive-up machine in a taxi and does not want to reveal his PIN to the driver.
I wrote back to my correspondent that I tell my students their answers don't have to be correct.... And since the the dots cause no harm, and might actually be of use, regulators might well find it advantageous to require them, thereby enabling themselves to say, at year's end, that they had done something useful.
1. Are sodas ever refrigerated in a store?
2. Are rectangular milk containers ever single serving?
3. Are milk containers ever round?
4. When soda is sold in amounts greater than a single serving, what is the shape of the container?