The underlying assumption is that we should all follow the same linear path from childhood until death, spending the majority of each day at work, trying to climb the ladder, to get a raise, to buy a bigger house, to fill it with an abundance of unnecessary possessions that provide very little satisfaction. Only after retiring is there freedom to explore, relax, or spend time with the people we love and cherish.
The doctor or lawyer, for instance, could use her or his income to invest in a medical start-up or buy shares of medical companies he understands such as Johnson & Johnson. Over time, the nature of compounding, dollar cost averaging, and reinvesting dividends can result in her or his portfolio generating substantial passive income. The downside is that it can take decades to achieve enough to truly improve your standard of living. However, it is still the surest path to wealth based on the historical performance of business ownership and stocks.