Final answer:
Tertiary activities being market-oriented refers to the focus on providing services within the market to consumers, where the value is tied to demand. These services, unlike goods produced in primary and secondary sectors, contribute largely to developed economies like the U.S., making up a significant portion of the GDP.
Step-by-step explanation:
When the statement mentions that tertiary activities are exclusively market-oriented, it means that these activities are primarily concerned with providing services that are sold in the market to consumers. Unlike the primary and secondary sectors, which produce tangible goods, the tertiary sector's output is intangible services. The value of these services is dependent on the demand in the market, which can be influenced by consumer spending and the attraction of foreign visitors through avenues such as tourism.
The tertiary sector encompasses a wide range of services such as healthcare, education, finance, hospitality, and entertainment. It is a significant part of the economy, particularly in developed nations like the United States, where it accounts for more than three-quarters of the GDP. This sector has experienced substantial growth since the 1970s, overtaking primary and secondary sector jobs in terms of employment.