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 ...

You never know when you might come across a valuable error coin, so it helps to know what to look for. Here's a look at five of the most valuable error coins.