Some occupations will be affected by both changes in technology and business practice and also by declines in the industries in which they are employed. Such occupations include farmers, farm workers, welfare eligibility workers and interviewers, and railroad brake, signal, and switch operators. Job openings in any occupation occur for two reasons. Some are new jobs resulting from additional demand for a particular kind of worker. Other openings are for replacement workers in existing jobs.
People retire and people quit.
In most occupations, replacement needs exceed new growth. Even occupations that are projected to decline will provide some job openings. Many jobs are expected for retail salespersons, cashiers, waiters and waitresses, marketing and sales worker supervisors, and food, counter, fountain, and related workers. These will largely be replacement jobs. New jobs in the trade sector are projected to increase more slowly in the coming period than in the recent past.