Smart teenagers who engage in illicit activities are much more likely to become entrepreneurs, according to research by Ross Levine and Yona Rubinstein. But, they note, being self-employed doesn't necessarily make someone an entrepreneur: recognising this distinction has enabled them to detect...

We disaggregate the self-employed into incorporated and unincorporated to distinguish between "entrepreneurs" and other business owners. The incorporated self-employed have a distinct combination of cognitive, noncognitive, and family traits. Besides coming from higher-income families with...