Wealthy Investors vs. Wealthy Entrepreneurs
"There are more entrepreneurs than investors on the Forbes list of wealthiest people, but that doesn't mean entrepreneurship is necessarily a better wealth builder than investing. There's a selection bias in that entrepreneurs have much more concentrated asset allocation, often having nearly all of their net worth tied up in their own company (and usually not able to sell it very quickly), whereas investors are more diversified. Also, for every entrepreneur who strikes it big there are many others who completely fail, so the list is not a good guide to where the most wealth is being created."