The retail price of a knife is valid only at the moment it was purchased. Once the knife comes into the buyer’s possession, its value is linked to what is called the
secondary market. Once a knife is purchased, most of the costs associated with the retail price (i.e. advertising, production cost, shipping cost, etc.) must be deducted from the retail cost to determine the object’s immediate value on the secondary market, thus, retail cost is not equivalent to secondary market resale value. Depending on several different factors, individuals, auctioneers, and secondary retailers may sell a knife for more, the same, or less than what they originally paid for it. These factors include, but are not limited to, condition, age, supply, and demand. The 1960s through the present were major years for the manufacturing of contemporary collectible knives. Some custom knife makers have large followings of collectors. Because demand far outweighs the supply, it is not uncommon for these knives to appreciate substantially within seconds of buying them from the maker. The secondary market can range anywhere from 50% to 200% of the knife's original value. A price guide is a resource such as a book or website that lists typical selling prices. Most knife publications offer annual price guides to give collectors an idea of what their knives may be worth. ==Bibliography==