Final answer:
More than 75 percent of the labour force is occupied in tertiary or service sector activities in developed countries, accounting for a significant portion of the GDP and representing a shift from primary and secondary sectors.
Step-by-step explanation:
More than 75 percent of the labour force is occupied in tertiary activities. This sector is also known as the service sector and includes a wide range of occupations, such as engineering, finance, restaurants, sports, childcare, and medicine. In developed economies like the United States and Western Europe, a significant shift has occurred from primary and secondary sector jobs to tertiary sector ones due to economic development and increased automation in agriculture and manufacturing.
The tertiary sector is essential in developed countries and contributes more than three-quarters of the GDP. The U.S. Bureau of Labor Statistics reported that around 80 percent of the U.S. workforce is employed in this sector. Advancements in technology and increased automation have led to a decrease in the primary and secondary sectors, with more workers moving into service industries.