Errors increase the value of collectibles because a limited number go into circulation before it is spotted and corrected.

Quarters have been a part of American coinage since 1796, but while most are worth only 25 cents, some rare issues are worth thousands—or even millions—of dollars. Their value often comes from rarity, ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...