> This study is evidence that if your aim is to make more money, switching from salaried work to running an incorporated business is typically rewarded with a significant boost in earnings.

What about survivorship bias? I.e. most entrepreneurs fail, so you get a skewed sample when looking at existing entrepreneurs.

Also while it might be easier to just analyze two categories (incorporated vs. not), really one should break down entrepreneurial ventures into at least three categories:

- self-employed / contractor (from baby sitter to software consultant)

- small business (e.g. restaurant)

- startup (seeking to become large company)