Answer:
Gross Domestic Product.
Explanation:
The Gross Domestic Product is the measure to scale the economy of any country. They are used by the experts or the economist to check how each country is performing in their national productions which boost their economy.
The Gross Domestic Product is the total produce of a country in terms of products as well as services of that country in a particular financial year. It is popularly known as the GDP. It is used to measure the economic performances of any country.
In the context, Stephanie wishes to study abroad in such a country which has economic growth for the last five years. For this she could see how much is the GDP of that country. More is the GDP, more is the economic growth of the country.
Thus Stephanie uses Gross Domestic Product or GDP to measure the economic performance of the countries.