The paper is by Ross Levine and Yana Rubinstein.

We use the classification of the self-employed into incorporated and unincorporated to separate between “entrepreneurs” and other business owners. Using data from the CPS and the NLSY79, we find, in contrast to a large body of research, that entrepreneurs earn much more per hour and work many more hours than their salaried and unincorporated counterparts. Moreover, the incorporated self-employed have distinct cognitive and noncognitive traits: they are more educated, and even as teenagers, they score higher on learning aptitude tests, exhibit greater self-esteem, and engage in more aggressive, illicit, risk-taking activities. And, these traits are much more important for entrepreneurial success than they are for success in other employment activities.

The press has picked up on the part about teenage propensity for illicit, risk-taking activities. Doesn’t describe me as a teenager.