In 1970, only 2% of firefighters had college degrees; now 18% do, according to Richard Vedder, an economist at Ohio University. Fewer than 1% of taxi drivers had a college degree in 1970; now 15% do. About 25% of retail sales clerks have college degrees, Vedder said.
"The main reason is a pretty simple one," he said. "The number of college graduates has grown vastly faster than the number of jobs that require high-level education skills."
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