Both Uses

prosperous
in
Outliers
(Edited)

"To me the greatest wonder in this was not the mere quantity of garments, although that was a miracle in itself," Borgenicht would write years later, after he became a prosperous manufacturer of women's and children's clothing, "but the fact that in America even poor people could save all the dreary, time-consuming labor of making their own clothes simply by going into a store and walking out with what they needed."
Chpt 5

prosperous = financially successful
The sons and the father become prosperous.
Chpt 5 *

Definitions:

(1) (prosperous)
successful or good -- especially with regard to finances or wealth
(2) (meaning too rare to warrant focus)