John D. Rockefeller - Would he ever have been an oil magnate without childhood entrepreneurial lessons? See-> the Stanford and Tufts YES Project, Young Entrepreneurs Study
"Industrious even as a boy, the future oil magnate earned money by raising turkeys, selling candy and doing jobs for neighbors." -history.com http://goo.gl/FJxh2D
Building on Simon Blampied's post, could childhood entrepreneurship experiences be a driving factor in career trajectory?
Check out this YES Project report which asserts: "effective entrepreneurial skills may be one instance of vocational competence."