https://www.bls.gov/cps/cps_htgm.htm
例子：
- Elena reported to the interviewer that last week she worked 40 hours as a sales manager for a beverage company. Elena is employed.
- Steve lost his job when the local plant of an aircraft manufacturing company closed down. Since then, he has been contacting other businesses in town trying to find a job. Steve is unemployed.
- Linda is a stay-at-home mother. Last week, she was occupied with her normal household activities. She neither held a job nor looked for a job. Her 80-year-old father who lives with her has not worked or looked for work because of a disability. Linda and her father are not in the labor force.
