Commodity

A commodity is any item or resource which

TODO: what's the best definition here? That it can be collected in theoretically infinite amounts? That it occupies a dedicated inventory? (Some currencies don't, and some things which aren't commodities do.) Is "commodity" even the best term?

It is contrasted with items which are unique, finite,. Currencies are commodities by definition, and are one of the most common examples.

Other sometimes commodities include:


 * Keys
 * Lockpicks
 * Ammunition