Paragon exemplars are ideal individual case. Michael Jordan is a paragon exemplar for basketball. The anti-paragon exemplar is the worst individual case of a category. Dennis Rodman is an anti-paragon exemplar of basketball. Exemplars are the actual members of a category which we perceive to be the best or the worst members of that category.
Commercials use paragons and anti-paragons a lot.
You can do reasoning with these prototypes as positive and negative role models. Salient examples are used to make probability judgments. Also, after the mad cow disease scare, fewer people would eat beef. The probability judgments based on salient examples are not rational. Necessary and sufficient conditions have to do with essence, a special kind of prototype.