If a person doesn't have capital, just labor, what small business are they supposed to start?
Taxicabs, street vending, hair braiding, beauty care, construction trades, etc.
All those businesses take capital as well as labor --accept for maybe hair braiding we're talking five figures easy. For over a million years virtual all human procuction has required a mix of both labor and capital.
Even digging for roots takes capital, unless you have nails of iron. Can you imagine the carpenter without his hammer or the manager without his mental capital? That said, the discussion was on the ease with which a person can enter the labor market and use the excess capital earned there to invest in the stock market as a way to participate in a business. Felons and others have trouble getting that kind of job. Most of the American workforce is hand to mouth.