1. is the most common way to measure the standard of living in different countries.
a) gdp per capita
b) nominal gdp
c) real gdp

I believe the correct answer from the choices listed above is option C. Real GDP  is the most common way to measure the standard of living in different countries. It  is a macroeconomic measure of the value of economic output adjusted for price changes. Hope this answers the question.

Afederal parliamentary republic is  unlimited.