Final answer:
In the United States, about 27.6 million people are employed part-time. All individuals working part-time are considered employed in U.S. labor statistics, including full-time students with part-time jobs and senior citizens who work while receiving social security.
Step-by-step explanation:
Approximately 27.6 million people work part-time in the United States. In U.S. labor statistics, if you are out of school but working part-time, you are considered employed. Similarly, if you are a full-time student working 12 hours per week at a college cafeteria, you're also considered employed. Finally, a senior citizen who is collecting social security and a pension, and is working as a greeter at Wal-Mart, is regarded as employed. All persons who perform any amount of work for pay or profit are classified as employed in the labor force.