Earlier quoted context omitted.
There is. Basic level of labor is almost always there - people have to work to earn the living (even if you go into crime, you still have to work - maybe you pay taxes to different people and do different things, but you still have to do stuff to earn your money). However, once you earned enough money, beyond subsistence level, you have a choice - you can spend it all on consumption, or you can defer some of the cons…
This is predicted on the unstated assumption that everyone starts out from about the same place and subsequently people make a variety of different choices. It ignores the effect of inheritance or the costs of increasingly binomial wealth distribution.
Moving onto more statistical approach, this one: https://www.fa-mag.com/news/most-millionaires-self-made--stu... says only 8% of millionaires inherited their wealth. For billionaires, according to this: https://www.entrepreneur.com/article/269593 18% got a jump-start (maybe parents were mere millionaires, but the child became a billionaire), and 62% are self-made. So inheritance effects exist, but maybe they are not that huge? At least, clearly, not a majority.
Of course, not everybody starts in the same place. But human behavior and motivations are similar, and thus you can reason about them despite the differences.