Employment in the United States is shifting from agriculture and the manufacturing sector to the service sector. Service sector jobs are those that do not involve the manufacturing of a product or extracting raw materials from nature. This includes people who work in telecommunications, insurance, and banking, as well as store clerks and transportation workers. In 1950, half of all workers worked in manufacturing. By 2000, employment in the manufacturing sector had dropped to 18 percent. Conversely, employment in the service sector has grown dramatically. In 1970, 66 percent of workers worked in services. By 2000, employment in the service sector had grown to 80 percent. This pattern is typical of advanced industrial societies. One reason for the shift in employment is that low-paying, low-tech manufacturing jobs have been moving to developing countries. Developed countries have concentrated on medium and high technology manufacturing, which require less labor-intensive production methods. However, many jobs in the service sector do not pay as well as manufacturing jobs, nor do they include the same benefits. In addition, good jobs in the service sector may require higher education and advanced training, which displaced manufacturing workers may not have.