Which term specifically measures the market value of goods and services produced within a nation?

The term that specifically measures the market value of goods and services produced within a nation is GDP, which stands for Gross Domestic Product. GDP quantifies the total monetary value of all finished goods and services made within a country's borders in a specific time period, usually annually or quarterly. It serves as a broad indicator of a nation’s economic health and is widely used to gauge the size of an economy and its growth rate.

In contrast, GNI, or Gross National Income, includes not only the GDP but also net income earned by residents from investments abroad minus income earned by foreign residents from domestic investments. GPS refers to the Global Positioning System, which is unrelated to economic measurements, and GEB appears to be an acronym not directly related to economic indicators. Thus, GDP is the accurate choice for measuring the market value of goods and services produced within a country.