information:extraction, information:highlighting
Value of collected items

After a collectable has been purchased, its retail price no longer applies and its value is linked to what is called the secondary market. There is no secondary market for an item unless someone is willing to buy it, and an object's value is whatever the buyer is willing to pay. Depending on age, condition, supply, demand, and other factors, individuals, auctioneers, and secondary retailers may sell a collectable for either more or less than what they originally paid for it. Special or limited edition collectables are created with the goal of increasing demand and value of an item due to its rarity. A price guide is a resource such as a book or website that lists typical selling prices.

Products often become more valuable with age. The term antique generally refers to manufactured items made over 100 years ago, although in some fields, such as antique cars, the time frame is less stringent. For antique furniture, the limit has traditionally been set in the 1830s. Collectors and dealers may use the word vintage to describe older collectables that are too young to be called antiques, including Art Deco and Art Nouveau items, Carnival and Depression glass, etc. Items which were once everyday objects but may now be collectable, as almost all examples produced have been destroyed or discarded, are called ephemera.