Introduction:
The advancement of international trade is often considered as a significant indicator of a country's economic prosperity. International trade refers to the exchange of goods, services, and capital across borders between different countries. It plays a crucial role in determining the economic growth and development of a nation. This response elaborates on how the advancement of international trade can be seen as an index to a country's economic prosperity.

Enhanced Economic Growth:
- International trade opens up new markets and opportunities for businesses to expand their customer base beyond domestic borders.
- By participating in international trade, countries can tap into a larger global market, leading to increased demand for their goods and services.
- This increased demand stimulates production, leading to higher economic growth rates.
- Furthermore, international trade allows countries to specialize in the production of goods and services where they have a comparative advantage, leading to increased efficiency and productivity.

Job Creation and Increased Employment:
- Advancement in international trade leads to the creation of new job opportunities.
- Export-oriented industries require a skilled workforce to meet the demands of global markets.
- Increased employment levels contribute to higher income levels and improved living standards for the population.
- As international trade expands, it also drives the development of supporting industries and services, further generating employment opportunities.

Foreign Exchange Earnings:
- International trade enables a country to earn foreign exchange through the export of goods and services.
- This foreign exchange can be used to import essential goods, advanced technology, and machinery, which are crucial for economic development.
- A higher level of foreign exchange reserves strengthens a country's ability to meet its external obligations and stabilize its currency.

Technological Advancements:
- International trade facilitates the transfer of technology between countries.
- Developed countries often export advanced technology and machinery to less developed countries, enabling them to enhance their production capabilities.
- Access to new technologies can lead to increased productivity, efficiency, and competitiveness in domestic industries.

Improved Standard of Living:
- International trade allows countries to access a wider variety of goods and services at competitive prices.
- This enhances consumer welfare by providing more choices and better quality products.
- Additionally, increased trade can lead to a reduction in prices due to economies of scale and increased competition.
- The availability of affordable goods and services improves the standard of living for the population.

Conclusion:
The advancement of international trade is indeed an index to a country's economic prosperity. It enhances economic growth, creates employment opportunities, boosts foreign exchange earnings, facilitates technological advancements, and improves the standard of living. Countries that actively participate in international trade tend to experience higher levels of economic development and prosperity.