To determine the measure of the total value of all products sold in a country, we can look at the definitions and relevance of the given options:
A. Standard of Living: This refers to the level of wealth, comfort, material goods, and necessities available to a certain socioeconomic class or geographic area. It is more about the quality and quantity of goods and services available to people, not specifically the total value of products sold.
B. Per Capita Income: This is the average income earned per person in a given area in a specified year. It is calculated by dividing the area's total income by its total population. While it gives an estimate of income, it doesn't measure the total value of all products sold in the country.
C. Gross Domestic Product (GDP): This is the total value of all goods and services produced within a country's borders in a specific period, usually a year. GDP includes all private and public consumption, government outlays, investments, and exports minus imports. Therefore, GDP is a comprehensive measure of a country's overall economic output and the total value of all products sold.
D. Trade Index: This generally refers to various indices used to measure the performance, volume, or value of trade. Examples include trade balances, export-import ratios, etc. However, this does not directly measure the total value of all products sold in the country.
Given these explanations, the correct measure of the total value of all products sold in a country is Gross Domestic Product (GDP). Thus, the answer is:
Gross Domestic Product (GDP)
