In a study of a large state university, students were randomly assigned, roommates. Researchers found that, on average, males assigned to roommates who reported drinking alcohol in the year before entering college had GPAs one-quarter point lower than those assigned to non-drinking roommates. For males who drank frequently before college, being assigned to a roommate who also drank frequently before college reduced their GPAs by two-thirds of a point.
The marginal social benefit curve will be:

The answer would be

MSB = new demand curve; demand curve (MPB) shifts less for negative externalities

Explanation:

Africans having pride in their own culture despite being ruled by people of different cultures gave them a sense of self worth.

Explanation:

The people of Africa were ruled by people of different cultures and by the people from different countries. They had a history of colonial rule where they were a colony of many countries.

But despite being ruled by people of different cultures, the people of Africa had pride in their own culture. This gave these people a sense of self worth. The Africans had pride in their own culture, in their own language and their own nation.