Comparison involves studying two or more things to identify their similarities, differences, superiority, or inferiority. Similarities can form the basis for induction and analogy, while differences can be used to prove or disprove an argument. Aristotle proposed several criteria for comparison, including that a greater number of things is more desirable, ends are greater goods than means, scarcity makes things greater, what wise men choose is better, and majorities are better than minorities.