What do you mean with 12 century leaders. Are you sure it says 12 century?
Economic growth means that consumers are spending more money.
If consumers are spending more money it means that the overall income has increased. When the people's income increases, the demand increases which in return encourages investment and production, increasing supply. Economic growth is often measured using a country's GDP (gross domestic product) and GDP per capita over a period of time. A country's GDP measures the value of the internal production of a country.
This sentence is correct for defining cultures. We can see the clear differences with the cultures around the world. Comparing latinoamerican cultures with asian cultures for examples, gives us an idea of the result of specific groups living in an specific place.