Consider the following grading system for a hypothetical economics class. Students earn course points and at the end of the semester each student keeps her/his own course points and receives a letter grade based on how many course points (s)he earns (for example, 90 course points or higher equals an A). Each student may also voluntary sacrifice one letter grade and donate this to a student with a lower grade. Which economic system is most comparable to the grading system described above?
Socialism (mixed economy.)