The higher a country's economic development, the

higher the GDP

Explanation:

The higher a country's economic development, the higher the country's GDP will be. The GDP represents the total production of goods and services in one year in a particular country, thus it provides information about the economic strength and development of the country. If the country has an upward trend, or rather the economic development is on a high level, it means that the country's GDP is constantly on the rise, as it is what provides the economic development.

is this from a story?

if so, can you tell which one?

~courtney