January 23, 2012

Tufte makes curry

Yesterday at a big box supermarket, I stumbled on this:


These two coconut milks appear to be nearly identical products. Given they were representing themselves as commodities, I was solely making my choice based on price. However, the store didn't make my choice simple or easy.

The can on the left retails for $1.39. The can on the right retails for $3.00 for 5. Furthermore, the prices are listed in different font sizes. Why isn't the price listed for an individual can, even though the cans differ in size by 0.5 oz? I was drawn to the red box, which reads "$1.65 per pound" for the left one and "the price is "$3.95 per quart" for the right one! The store chooses different metrics for the same goods, thus making a meaningful comparison very difficult. Imagine one gas station selling gas by the gallon and another station selling it by the pound. Because those stickers are unnecessarily different on multiple levels, the don't serve their function as more objective sources of information.

There is both a science and art in creating meaningful information. A foundation in basic science is a good place to start.

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