Any time you can earn more than you spend, and take advantage of compound interest (index funds, etc), you could eventually become rich, i.e. upward mobility.

Any time you can earn more than you spend, and take advantage of compound interest (index funds, etc), you could eventually become rich, i.e. upward mobility. In terms of jobs, it seems there are fewer guarantees and fewer formulas to follow (you used to be able to work somewhere for 30 years and count on a pension). Upward mobility is still alive and well, but it's through self education and using the internet. Constantly improving is the only way to beat the game. Discipline, etc.