As fewer Americans have visited shopping malls, more cyclists have been killed on US roads, a correlation that suggests either that mall-goers were the cyclists' natural protectors or that the same smartphone-driven economy killing the mall is also killing the cyclist. The coefficient is -0.870 across twenty-one years, during which the mall foot traffic declined with the slow dignity of a format that knows its era has passed, and cycling fatalities rose with the grim persistence of a problem no one has solved. The food court empties, the bike lane fills, and the chart draws its melancholy line.
Mall foot traffic peaked in the early 2000s and has declined steadily as e-commerce captured an increasing share of retail spending—from about 5 percent in 2002 to over 20 percent by 2022. Cycling fatalities grew from about 660 to over 1,000 during the same period as more people commuted by bicycle in cities that had not built adequate infrastructure. Both trends are products of the smartphone economy: the phone replaced the mall trip with online shopping and simultaneously enabled the urban lifestyle (cycling, delivery apps, ride-sharing) that puts more cyclists on roads designed for cars. The shared variable is not commerce but the restructuring of American life around a pocket computer.
Twenty-one years of malls declining and cycling deaths rising is a story about how Americans get around: less driving to malls, more cycling to everywhere else, on roads that were optimized for the trip they no longer take. The parking lot empties, the bike lane fills, and the infrastructure lags behind both changes. The mall dies, the cyclist rides, and the road serves neither well.
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Want to learn more about why correlations like “Shopping mall foot traffic” vs “Bicyclist traffic fatalities” don't prove causation? Read our guide to statistical thinking.