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

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 ...

Thousands of hobbyists across the United States are walking into banks, buying rolls of coins at face value, and sorting through them for rare dates, mint errors, and silver pieces worth many times ...