Assuming that there is no change in a person's spending or professional income and assuming that they are spending less than they earn and doing something productive with it, then over a long period of time a person's net worth should start to accelerate. But what if it doesn't? Take a look a this case example to learn more.
You're interviewing for a new job, and you ask whether the company offers a retirement account. The employer says yes, and you move on to other topics. When you accept the job, you enroll in the retirement account and begin making contributions, but later on, you're disappointed by your savings.