In Table 2, compare the unemployment rate for teenagers to the unemployment rate for adults.
Why are these rates different?

There are a number of explanations for the unemployment rate differentials between teenagers and adults. Many jobs require a degree of education, skill, and experience that teenagers lack. Education and experience measure the amount of what economists call human capital. Most adults possess more human capital than teenagers because they have attended college and professional schools, have been trained in a particular field, and have job experience. The degree of specialization and increased knowledge in a field, not to mention an understanding of the demands of many workplaces, will tend to make an adult worker more productive than a teenager. When an employer is hiring workers, the employer most often attempts to hire the most productive candidate, which is often the more educated and more skilled worker. Therefore, adults are preferentially hired over teenagers, an event that leads to adults having a lower unemployment rate than teenagers.