Consider the following grading system for a hypothetical economics class. Students earn a letter grade depending on how many course points they earn (i.e. higher than 90 is an A, etc.). There is no required redistribution of grades, but students with a higher letter grade may voluntarily give up a letter grade to students with a lower letter grade. In terms of income distribution, which economic system is most comparable to the grading system described above?

Group of answer choices

Capitalism.

Communism.

Socialism, or a mixed economy.

Anarchy.