The values of collectible trading cards are determined by a variety of factors such as scarcity, rarity, condition, demand, popularity, and historical significance. Scarcity refers to the availability of the card and how rare it is compared to other cards in circulation. The condition of the card is also an important factor, as cards in better condition command higher values than those that are damaged or worn.

Demand is another key factor that affects the value of trading cards, as more sought-after cards tend to be more valuable than less popular ones. Finally, historical significance, like the card being an original or being a part of a special event, can greatly affect the value of a collectible trading card. Additionally, the popularity of the person or event depicted on the card can also drive up its value, as collectors may be willing to pay a premium for cards featuring famous athletes or cultural icons. Overall, the value of collectible trading cards is determined by a combination of these and other factors, and the market for these cards can be quite volatile, with values changing frequently based on supply and demand.